DADOXYLON (Gr. dadion, a torch; xulon, wood). An extinct genus of Coniferous trees.
DECAPODA (Gr. deka, ten; podes, feet). The division of Crustacea which have ten feet; also the family of Cuttle-fishes, in which there are ten arms or cephalic processes.
DECIDUOUS (Lat. decido, I fall off). Applied to parts which fall off or are shed during the life of the animal.
DEINOSAURIA (Gr. deinos, terrible; saura, lizard). An extinct order of Reptiles.
DEINOTHERIUM (Gr. deinos, terrible; therion, beast). An extinct genus of Proboscidean Mammals.
DENDROGRAPTUS (Gr. dendron, tree; grapho, I write). A genus of Graptolites.
DESMIDIÆ. Minute fresh-water plants, of a green colour, without a siliceous epidermis.
DIATOMACEÆ (Gr. diatemno, I sever). An order of minute plants which are provided with siliceous envelopes.
DIBRANCHIATA (Gr. dis; twice; bragchia, gill). The order of Cephalopoda (comprising the Cuttle-fishes, &c.) in which only two gills are present.
DICERAS (Gr. dis, twice; keras, horn). An extinct genus of Bivalve Molluscs.
DICTYONEMA (Gr. diktuon, a net; nema, thread). An extinct genus of Polyzoa.
DICYNODONTIA (Gr. dis, twice; kuon, dog; odous, tooth). An extinct order of Reptiles.
DIDYMOGRAPTUS (Gr. didumos, twin; grapho, I write). A genus of Graptolites.
DIMORPHODON (Gr. dis, twice; morphé, shape; oduos, tooth). A genus of Pterosaurian reptiles.
DINICHTHYS (Gr. deinos, terrible; ichthus, fish). An extinct genus of Fishes.
DINOCERAS (Gr. deinos, terrible; keras, horn). An extinct genus of Mammals.
DINOPHIS (Gr. deinos, terrible; ophis, snake). An extinct genus of Snakes.
DINORNIS (Gr. deinos, terrible; ornis, bird). An extinct genus of Birds.
DIPLOGRAPTUS (Gr. diplos, double; grapho, I write). A genus of Graptolites.
DIPNOI (Gr. dis, twice; pnoé, breath). An order of Fishes, comprising the Mud-fishes, so called in allusion to their double mode of respiration.
DIPROTODON (Gr. dis, twice; protos, first; odous, tooth). A genus of extinct Marsupials.
DIPTERA (Gr. dis, twice; pteron, wing). An order of Insects characterised by the possession of two wings.
DISCOID (Gr. diskos, a quoit; eidos, form). Shaped like a round plate or quoit.
DOLOMITE (named after M. Dolomieu). Magnesian limestone.
DORSAL (Lat. dorsum, the back). Connected with or placed upon the back.
DROMATHERIUM (Gr. dromaios, nimble; therion, beast). A genus of Triassic Mammals.
DRYOPITHECUS (Gr. drus, an oak; pithekos, an ape). An extinct genus of Monkeys.

ECHINODERMATA (Gr. echinos; and derma, skin). A class of animals comprising the Sea-urchins, Star-fishes, and others, most of which have spiny skins.
ECHINOIDEA (Gr. echinos; and eidos, form). An order of Echinodermata, comprising the Sea-urchins.
EDENTATA (Lat. e, without; dens, tooth). An order of Mammalia often called Bruta.
EDENTULOUS. Toothless, without any dental apparatus. Applied to the mouth of any animal, or to the hinge of the Bivalve Molluscs.
ELASMOBRANCHII (Gr. elasma, a plate; bragchia, gill). An order of Fishes, including the Sharks and Rays.
ENALIOSAURIA (Gr. enalios, marine; saura, lizard), Sometimes employed as a common term to designate the extinct Reptilian orders of the Ichthyosauria and Plesiosauria.
EOCENE (Gr. eos, dawn; kainos, new or recent). The lowest division of the Tertiary rocks, in which species of existing shells are to a small extent represented.
EOPHYTON (Gr. eos, dawn; phuton, a plant). A genus of Cambrian fossils, supposed to be of a vegetable nature.
EOZOÖN (Gr. eos, dawn; zoön, animal). A genus of chambered calcareous organisms found in the Laurentian and Huronian formations.
EQUILATERAL (Lat. œquus, equal; latus, side). Having its sides equal. Usually applied to the shells of the Brachiopoda. When applied to the spiral shells of the Foraminifera, it means that all the convolutions of the shell lie in the same plane.
EQUISETACEÆ (Lat. equus, horse; seta, bristle). A group of Cryptogamous plants, commonly known as "Horse-tails."
EQUIVALVE (Lat. œquus, equal; valvœ, folding-doors). Applied to shells which are composed of two equal pieces or valves.
ERRANTIA (Lat. erro, I wander). An order of Annelida, often called Nereidea, distinguished by their great locomotive powers.
EUOMPHALUS (Gr. eu, well; omphalos, navel). An extinct genus of Univalve Molluscs.
EURYPTERIDA (Gr. eurus, broad; pteron, wing). An extinct sub-order of Crustacea.
EXOGYRA (Gr. exo, outside; guros, circle). An extinct genus of Oysters.

FAUNA (Lat. Fauni, the rural deities of the Romans). The general assemblage of the animals of any region or district.
FAVOSITES (Lat. favus, a honeycomb). A genus of Tabulate Corals.
FENESTELLIDÆ. (Lat. fenestella, a little window). The "Lace-corals," a group of Palæozoic Polyzoans.
FILICES (Lat. filix, a fern). The order of Cryptogamic plants comprising the Ferns.
FILIFORM (Lat. filum, a thread; forma, shape). Thread-shaped.
FLORA (Lat. Flora, the goddess of flowers). The general assemblage of the plants of any region or district.
FORAMINIFERA (Lat. foramen, an aperture; fero, I carry). An order of Protozoa, usually characterised by the possession of a shell perforated by numerous pseudopodial apertures.
FRUGIVOROUS (Lat. frux, fruit; voro, I devour). Living upon fruits.
FUCOIDS (Lat. fucus, sea-weed; Gr. eidos, likeness). Fossils, often of an obscure nature, believed to be the remains of sea-weeds.
FUSULINA (Lat. fusus, a spindle). An extinct genus of Foraminifera.

GANOID (Gr, ganos, splendour, brightness). Applied to those scales or plates which are composed of an inferior layer of true bone covered by a superior layer of polished enamel.
GANOIDEI. An order of Fishes.
GASTEROPODA (Gr. gaster, stomach; pous, foot). The class of the Mollusca comprising the ordinary Univalves, in which locomotion is usually effected by a muscular expansion of the under surface of the body (the "foot").
GLOBIGERINA (Lat. globus, a globe; gero, I carry). A genus of Foraminifera.
GLYPTODON (Gr. glupho, I engrave; odous, tooth). An extinct genus of Armadillos, so named in allusion to the fluted teeth.
GONIATITES (Gr. gonia, angle). A genus of Tetrabranchiate Cephalopods.
GRALLATORES (Lat. grallœ, stilts). The order of the long-legged Wading Birds.
GRAPTOLITIDÆ. (Gr. grapho, I write; lithos, stone). An extinct sub-class of the Hydrozoa.
GYMNOSPERMS (Gr. gumnos, naked; sperma, seed). The Conifers and Cycads, in which the seed is not protected within a seed-vessel.

HALITHERIUM (Gr. hals, sea; therion, beast). An extinct genus of Sea-cows (Sirenia).
HAMITES (Lat. hamus, a hook). A genus of the Ammonitidœ.
HELIOPHYLLUM (Gr. helios, the sun; phullon, leaf). A genus of Rugose Corals.
HELLADOTHERIUM (Gr. Hellas, Greece; therion, beast). An extinct genus of Ungulate Mammals.
HEMIPTERA (Gr. hemi, and pteron, wing). An order of Insects in which the anterior wings are sometimes "hemelytra."
HESPERORNIS (Gr. Hesperos, the evening star; ornis, bird). An extinct genus of Birds.
HETEROCERCAL (Gr. heteros, diverse; kerkos, tail). Applied to the tail of Fishes when it is unsymmetrical, or composed of two unequal lobes.
HETEROPODA (Gr. heteros, diverse; podes, feet). An aberrant group of the Gasteropods, in which the foot is modified so as to form a swimming organ.
HIPPARION (Gr. hipparion, a little horse). An extinct genus of Equidœ.
HIPPOPOTAMUS (Gr. hippos, horse; potamos, river). A genus of Hoofed Quadrupeds—the "River-horses."
HIPPURITIDÆ. (Gr. hippos, horse; oura, tail). An extinct family of Bivalve Molluscs.
HOLOPTYCHIUS (Gr. holos, whole; ptucé, wrinkle). An extinct genus of Ganoid Fishes.
HOLOSTOMATA (Gr. holos, whole; stoma, mouth). A division of Gasteropodous Molluscs, in which the aperture of the shell is rounded, or "entire."
HOLOTHUROIDEA (Gr. holothourion, and eidos, form). An order of Echinodermata comprising the Trepangs.
HOMOCERCAL (Gr. homos, same; kerkol, tail). Applied to the tail of Fishes when it is symmetrical, or composed of two equal lobes.
HYBODUNTS (Gr. hubos, curved; odous, tooth). A group of Fishes of which Hybodus is the type-genus.
HYDROIDA (Gr. hudra; and eidos, form). The sub-class of the Hydrozoa, which comprises the animals most nearly allied to the Hydra.
HYDROZOA (Gr. hudra; and zoön, animal). The class of the Cœlenterata which comprises animals constructed after the type of the Hydra.
HYMENOPTERA (Gr. humen, a membrane; pteron, a wing). An order of Insects (comprising Bees, Ants, &c.) characterised by the possession of four membranous wings.

ICHTHYODORULITE (Gr. ichthus, fish; dorus, spear; lithos, stone). The fossil fin-spine of Fishes.
ICHTHYOPTERYGIA (Gr. ichthus; pterux, wing). An extinct order of Reptiles.
ICHTHYORNIS (Gr. ichthus, fish; ornis, bird). An extinct genus of Birds.
ICHTHYOSAURIA (Gr. ichthus; saura, lizard). Synonymous with Ichthyopterygia.
IGUANODON (Iguana, a living lizard; Gr. odous, tooth). A genus of Deinosaurian Reptiles.
INCISOR (Lat. incido, I cut). The cutting teeth fixed in the intermaxillary bones of the Mammalia, and the corresponding teeth in the lower jaw.
INEQUILATERAL. Having the two sides unequal, as in the case of the shells of the ordinary bivalves (Lamellibranchiata). When applied to the shells of the Foraminifera, it implies that the convolutions of the shell do not lie in the same plane, but are obliquely wound round an axis.
INEQUIVALVE. Composed of two unequal pieces or valves.
INOCERAMUS (Gr. is, a fibre; keramos, an earthen vessel). An extinct genus of Bivalve Molluscs.
INSECTA (Lat. inseco, I cut into). The class of articulate animals commonly known as Insects.
INSECTIVORA (Lat. insectum, an insect; voro, I devour). An order of Mammals.
INSECTIVOROUS. Living upon Insects.
INSESSORES (Lat. insedeo, I sit upon). The order of the Perching Birds, often called Passeres.
INTERAMBULACRA. The rows of plates in an Echinoid which are not perforated for the emission of the "tube-feet."
INTERMMAXILLÆ or PRÆMAXILLÆ. The two bones which are situated between the two superior maxillæ in Vertebrata. In man, and some monkeys, the præmaxillæ anchylose with the maxillæ, so as to be irrecognisable in the adult.
INVERTEBRATA (Lat. in, without; vertebra, a bone of the back). Animals without a spinal column or backbone.
ISOPODA. (Gr. isos, equal; podes, feet). An order of Crustacea in which the feet are like one another and equal.

KAINOZOIC (Gr. kainos, recent; zoe, life). The Tertiary period in Geology comprising those formations in which the organic remains approximate more or less closely to the existing fauna and flora.

LABYRINTHODONTIA (Gr. laburinthos, a labyrinth; odous, tooth). An extinct order of Amphibia, so called from the complex microscopic structure of the teeth.
LACERTILIA (Lat. lacerta, a lizard). An order of Reptilia comprising the Lizards and Slow-worms.
LAMELLIBRANCHIATA (Lat. lamella, a plate; Gr. bragchia, gill). The class of Mollusca comprising the ordinary bivalves, characterised by the possession of lamellar gills.
LEPIDODENDRON (Gr. lepis, a scale; dendron, a tree). A genus of extinct plants, so named from the scale-like scars upon the stem left by the falling off of the leaves.
LEPIDOPTERA (Gr. lepis, a scale; pteron, a wing). An order of Insects, comprising Butterflies and Moths, characterised by possessing four wings which are usually covered with minute scales.
LEPIDOSIREN (Gr. lepis, a scale; seiren, a siren—the generic name of the Mud-eel or Siren lacertina). A genus of Dipnoous fishes, comprising the "Mud-fishes."
LEPIDOSTROBUS (Gr. lepis, a scale; strobilos, a fir-cone). A genus founded on the cones of Lepidodendron.
LEPTÆNA (Gr. leptos. slender). A genus of Brachiopods.
LINGULA (Lat. lingula, a little tongue). A genus of Brachiopods.
LYCOPODIACEÆ (Gr. lupos, a wolf; pous, foot). The group of Cryptogamic plants generally known as "Club-mosses."

MACHÆRACANTHUS (Gr. machaira, a sabre; acantha, thorn or spine). An extinct genus of Fishes.
MACHAIRODUS (Gr. machaira, a sabre; odous, tooth). An extinct genus of Carnivora.
MACROTHERIUM (Gr. makros, long; therion. beast). An extinct genus of Edentata.
MACRURA (Gr. makros, long; oura, tail). A tribe of Decapod Crustaceans with long tails (e.g., the Lobster, Shrimp, &c.)
MAMMALIA (Lat. mamma, the breast). The class of Vertebrate animals which suckle their young.
MANDIBLE (Lat. mandibulum, a jaw). The upper pair of jaws in Insects; also applied to one of the pairs of jaws in Crustacea and Spiders, to the beak of Cephalopods, the lower jaw of Vertebrates, &c.
MANTLE. The external integument of most of the Mollusca, which is largely developed, and forms a cloak in which the viscera are protected. Technically called the "pallium."
MANUS (Lat. the hand). The hand of the higher Vertebrates.
MARSIPOBRANCHII (Gr. marsipos, a pouch; bragchia, gill). The order of Fishes comprising the Hag-fishes and Lampreys, with pouch-like gills.
MARSUPIALIA (Lat. marsupium, a pouch). An order of Mammals in which the females mostly have an abdominal pouch in which the young are carried.
MASTODON (Gr. mastos, nipple; odous, tooth). An extinct genus of Elephantine Mammals.
MEGALONYX (Gr. megas, great; onux, nail). An extinct genus of Edentate Mammals.
MEGALOSAURUS (Gr. megas, great; saura, lizard). A genus of Deinosaurian Reptiles.
MEGATHERIUM (Gr. megas, great; therion, beast). An extinct genus of Edentata.
MESOZOIC (Gr. mesos, middle; and zoe, life). The Secondary period in Geology.
MICROLESTES (Gr. mikros, little; lestes, thief). An extinct genus of Triassic Mammals.
MILLEPORA (Lat. mille, one thousand; porus, a pore). A genus of "Tabulate Corals."
MIOCENE (Gr. meion, less; kainol, new). The Middle Tertiary period.
MOLARS (Lat. mola, a mill). The "grinders" in man, or the teeth in diphyodont Mammals which are not preceded by milk-teeth.
MOLLUSCA (Lat. mollis, soft). The sub-kingdom which includes the Shell-fish proper, the Polyzoa, the Tunicata, and the Lamp-shells; so called from the generally soft nature of their bodies.
MOLLUSCOIDA (Mollusca; Gr. eidos, form). The lower division of the Mollusca, comprising the Polyzoa, Tunicata, and Brachiopoda.
MONOGRAPTUS (Gr. monos, single; grapho, I write). A genus of Graptolites.
MYLODON (Gr. mulos, a mill; odous, tooth). An extinct genus of Edentate Mammals.
MYRIAPODA or MYRIOPODA (Gr. murios, ten thousand; podes, feet). A class of Arthropoda comprising the Centipedes and their allies, characterised by their numerous feet.

NATATORES (Lat. nare, to swim). The order of the Swimming Birds.
NATATORY (Lat. nare, to swim). Formed for swimming.
NAUTILOID. Resembling the shell of the Nautilus in shape.
NERVURES (Lat. nervus, a sinew). The ribs which support the membranous wings of insects.
NEUROPTERA (Gr. neuron, a nerve; pteron, a wing). An order of Insects characterised by four membranous wings with numerous reticulated nervures (e.g., Dragon-flies).
NEUROPTERIS (Gr. neuron, a nerve; pteris, a fern). An extinct genus of Ferns.
NOTHOSAURUS (Gr. nothos, spurious; saura, lizard). A genus of Plesiosaurian Reptiles.
NOTOCHORD (Gr. notos, back; chorde, string). A cellular rod which is developed in the embryo of Vertebrates immediately beneath the spinal cord, and which is usually replaced in the adult by the vertebral column. Often it is spoken of as the "chorda dorsalis."
NUDIBRANCHIATA (Lat. nudus, naked; and Gr. bragchia, gill). An order of the Gasteropoda in which the gills are naked.
NUMMULINA (Lat. nummus, a coin). A genus of Foraminifera, comprising the coin-shaped "Nummulites."

OBOLELLA (Lat. dim. of obolus, a small coin). An extinct genus of Brachiopods.
OCCIPITAL. Connected with the occiput, or the back part of the head.
OCEANIC. Applied to animals which inhabit the open ocean (= pelagic).
ODONTOPTERYX (Gr. oduos, tooth; pterux, wing). An extinct genus of Birds.
ODONTORNITHES (Gr. oduos, tooth; ornis, bird). The extinct order of Birds, comprising forms with distinct teeth in sockets.
OLIGOCENE (Gr. oligos, few; kainos, new). A name used by many Continental geologists as synonymous with the Lower Miocene.
OPHIDIA (Gr. ophis, a serpent). The order of Reptiles comprising the Snakes.
OPHIUROIDEA (Gr. ophis, snake; oura, tail; eidos, form). An order of Echinodermata, comprising the Brittle-stars and Sand-stars.
ORNITHOSCELIDA (Gr. ornis, bird; skelos, leg). Applied by Huxley to the Deinosaurian Reptiles, together with the genus Compsognathus, on account of the bird-like character of their hind-limbs.
ORTHIS (Gr. orthos, straight). A genus of Brachiopods, named in allusion to the straight hinge-line.
ORTHOCERATIDÆ (Gr. orthos, straight; keras, horn). A family of the Nautilidœ, in which the shell is straight, or nearly so.
ORTHOPTERA (Gr. orthos, straight; pteron, wing). An order of Insects.
OSTEOLEPIS (Gr. osteon, bone; lepis, scale). An extinct genus of Ganoid Fishes.
OSTRACODA (Gr. ostrakon, a shell). An order of small Crustaceans which are enclosed in bivalve shells.
OTODUS (Gr. ota, ears; odous, tooth). An extinct genus of Sharks.
OUDENODON (Gr. ouden, none; odous, tooth). A genus of Dicynodont Reptiles.
OVIBUS (Lat. ovis, sheep; bos, ox). The genus comprising the Musk-ox.

PACHYDERMATA (Gr. pachus, thick; derma, skin). An old Mammalian order constituted by Cuvier for the reception of the Rhinoceros, Hippopotamus, Elephant, &c.
PALÆASTER (Gr. palaios, ancient; aster, star). An extinct genus of Star-fishes.
PALÆOCARIS (Gr. palaios, ancient; karis, shrimp). An extinct genus of Decapod Crustaceans.
PALÆOLITHIC (Gr. palaios, ancient; lithos, stone). Applied to the rude stone implements of the earliest known races of men, to the men who made these implements, or to the period at which they were made.
PALÆONTOLOGY (Gr. palaios, ancient; and logos, discourse). The science of fossil remains or of extinct organised beings.
PALÆOPHIS (Gr. palaios, ancient; ophis, serpent). An extinct genus of Snakes.
PALÆOSAURUS (Gr. palaios, ancient; saura, lizard). A genus of Thecodont Reptiles.
PALÆOTHERIDÆ. (Gr. palaios, ancient; ther, beast). A group of Tertiary Ungulates.
PALÆOZOIC (Gr. palaios, ancient; and zoe, life). Applied to the oldest of the great geological epochs.
PARADOXIDES (Lat. paradoxus, marvellous). A genus of Trilobites.
PATAGIUM (Lat. the border of a dress). Applied to the expansion of the integument by which Bats, Flying Squirrels, and other animals support themselves in the air.
PECOPTERIS (Gr. peko, I comb; pteris, a fern). An extinct genus of Ferns.
PECTEN (Lat. a comb). The genus of Bivalve Molluscs comprising the Scallops.
PECTORAL (Lat. pectus, chest). Connected with, or placed upon, the chest.
PENTACRINUS (Gr. penta, five; krinon, lily). A genus of Crinoids in which the column is five-sided.
PENTAMERUS (Gr. penta, five; meros, part). An extinct genus of Brachiopods.
PENTREMITES (Gr. penta, five; trema, aperture). A genus of Blastoidea, so named in allusion to the apertures at the summit of the calyx.
PERENNIBRANCHIATA (Lat. perennis, perpetual; Gr. bragchia, gill). Applied to those Amphibia in which the gills are permanently retained throughout life.
PERISSODACTYLA (Gr. perissos, uneven; daktulos, finger). Applied to those Hoofed Quadrupeds (Ungulata) in which the feet have an uneven number of toes.
PETALOID. Shaped like the petal of a flower.
PHACOPS (Gr. phaké, a lentil; ops, the eye). A genus of Trilobites.
PHALANGES (Gr. phalanx, a row). The small bones composing the digits of the higher Vertebrata. Normally each digit has three phalanges.
PHANEROGAMS (Gr. phaneros, visible; gamos, marriage). Plants which have the organs of reproduction conspicuous, and which bear true flowers.
PHARYNGOBRANCHII (Gr. pharugx, pharynx; bragchia, gill). The order of Fishes comprising only the Lancelet.
PHASCOLOTHERIUM (Gr. phaskolos, a pouch; therion, a beast). A genus of Oolitic Mammals.
PHRAGMACONE (Gr. phragma, a partition; and konos, a cone). The chambered portion of the internal shell of a Belemnite.
PHYLLOPODA (Gr. phullon, leaf; and pous, foot). An order of Crustacea.
PINNATE (Lat. pinna, a feather). Feather-shaped; or possessing lateral processes.
PINNIGRADA (Lat. pinna, a feather; gradior, I walk). The group of Carnivora, comprising the Seals and Walruses, adapted for an aquatic life. Often called Pinnipedia.
PINNULÆ. (Lat. dim. of pinna). The lateral processes of the arms of Crinoids.
PISCES (Lat. piscis, a fish). The class of Vertebrates comprising the Fishes.
PLACOID (Gr. plax, a plate; eidos, form). Applied to the irregular bony plates, grains, or spines which are found in the skin of various fishes (Elasmobranchii).
PLAGIOSTOMI (Gr. plagios, transverse; stoma, mouth). The Sharks and Rays, in which the mouth is transverse, and is placed on the under surface of the head.
PLATYCERAS (Gr. platus, broad; keras, horn). A genus of Univalve Molluscs.
PLATYCRINUS (Gr. platus, broad; krinom, lily). A genus of Crinoidea.
PLATYRHINA (Gr. platus, broad; rhines, nostrils). A group of the Quadrumana.
PLATYSOMUS (Gr. platus, wide; soma, body). A genus of Ganoid Fishes.
PLEISTOCENE (Gr. pleistos, most; kainos, new). Often used as synonymous with "Post-Pliocene."
PLEUROTOMARIA (Gr. pleura, the side; tomé, notch). A genus of Univalve shells.
PLIOCENE (Gr. pleion, more; kainos, new). The later Tertiary period.
PLIOPITHECUS (Gr. pleion, more; pithekos, ape). An extinct genus of monkeys.
PLIOSAURUS (Gr. pleion, more; saura, lizard). A genus of Plesiosaurian Reptiles.
POLYCYSTINA (Gr. polus, many; and kustis, a cyst). An order of Protozoa with foraminated siliceous shells.
POLYPARY. The hard chitinous covering secreted by many of the Hydrozoa.
POLYPE (Gr. polus, many; pous, foot). Restricted to the single individual of a simple Actinozoön, such as a Sea-anemone, or to the separate zooids of a compound Actinozoön. Often applied indiscriminately to any of the Cœlenterata, or even to the Polyzoa.
POLYPORA (Gr. polus, many; poros, a passage). A genus of Lace-corals (Fenestellidœ).
POLYTHALAMOUS (Gr. polus; and thalamos, chamber). Having many chambers; applied to the shells of Foraminifera and Cephalopoda.
POLYZOA (Gr. polus; and zoön, animal). A division of the Molluscoida comprising compound animals, such as the Sea-mat—sometimes called Bryozoa.
PORIFERA (Lat. porus, pore; and fero, I carry). Sometimes used to designate the Foraminifera, or the Sponges.
PRÆMOLARS (Lat. prœ, before; molares, the grinders). The molar teeth of Mammals which succeed the molars of the milk-set of teeth. In man, the bicuspid teeth.
PROBOSCIDEA (Lat. proboscis, the snout). The order of Mammals comprising the Elephants.
PROCŒLOUS (Gr. pro, before; koilos, hollow). Applied to vertebræ the bodies of which are hollow or concave in front.
PRODUCTA (Lat. productus, drawn out or extended). An extinct genus of Brachiopods, in which the shell is "eared," or has its lateral angles drawn out.
PROTICHNITES (Gr. protos, first; ichnos, footprint). Applied to certain impressions in the Potsdam sandstone of North America, believed to have been produced by large Crustaceans.
PROTOPHYTA (Gr. protos; and phuton, plant). The lowest division of plants.
PROTOPLASM (Gr. protos; and plasso I mould). The elementary basis of organised tissues. Sometimes used synonymously for the "sarcode" of the Protozoa.
PROTOROSAURUS or PROTEROSAURUS (Gr. protos, first; orao, I see or discover; saura, lizard: or proteros, earlier; saura, lizard). A genus of Permian lizards.
PROTOZOA (Gr. protos; and zoön, animal). The lowest division of the animal kingdom.
PSAMMODUS (Gr. psammos, sand; odous, tooth). An extinct genus of Cestraciont Sharks.
PSEUDOPODIA (Gr. pseudos, falsity; and pous, foot). The extensions of the body-substance which are put forth by the Rhizopoda at will, and which serve for locomotion and prehension.
PSILOPHYTON (Gr. psilos, bare; phuton, plant). An extinct genus of Lycopodiaceous plants.
PTERANODON (Gr. pteron, wing; a, without; odous, tooth). A genus of Pterosaurian Reptiles.
PTERASPIS (Gr. pteron, wing; aspis, shield). A genus of Ganoid Fishes.
PTERICHTHYS (Gr. pteron, wing; ichthus, fish). A genus of Ganoid Fishes.
PTERODACTYLUS (Gr. pteron, wing; daktulos, finger). A genus of Pterosaurian Reptiles.
PTEROPODA (Gr. pteron, wing; and pous, foot). A class of the Mollusca which swim by means of fins attached near the head.
PTEROSAURIA (Gr. pteron, wing; saura, lizard). An extinct order of Reptiles.
PTILODICTYA (Gr. ptilon, a feather; diktuon, a net). An extinct genus of Polyzoa.
PTYCHOCERAS (Gr. ptucé, a fold; keras, a horn). A genus of Ammonitidœ.
PULMONATE. Possessing lungs.
PYRIFORM (Lat. pyrus, a pear; and forma, form). Pear-shaped.

QUADRUMANA (Lat. quatuor, four; manus, hand). The order of Mammals comprising the Apes, Monkeys, Baboons, Lemurs, &c.

RADIATA (Lat. radius, a ray). Formerly applied to a large number of animals which are now placed in separate sub-kingdoms (e.g., the Cœlenterata, the Echinodermata, the Infusoria, &c.)
RADIOLARIA (Lat. radius, a ray). A division of Protozoa.
RAMUS (Lat. a branch). Applied to each half or branch of the lower jaw, or mandible, of Vertebrates.
RAPTORES (Lat. rapto, I plunder). The order of the Birds of Prey.
RASORES (Lat. rado, I scratch). The order of the Scratching Birds (Fowls. Pigeons, &c.)
RECEPTACULITES (Lat. receptaculum, a storehouse). An extinct genus of Protozoa.
REPTILIA (Lat. repto, I crawl). The class of the Vertebrata comprising the Tortoises, Snakes, Lizards, Crocodiles, &c.
RETEPORA (Lat. reté, a net; porus, a pore). A genus of Lace-corals (Polyzoa).
RHAMPHORHYNCHUS (Gr. rhamphos, beak; rhugchos, nose). A genus of Pterosaurian Reptiles.
RHINOCEROS (Gr. rhis, the nose; keras, horn). A genus of Hoofed Quadrupeds.
RHIZOPODA (Gr. rhiza, a root; and pous, foot). The division of Protozoa comprising all those which are capable of emitting pseudopodia.
RHYNCHOLITES (Gr. rhugchos, beak; and lithos, stone). Beak-shaped fossils consisting of the mandibles of Cephalopoda.
RHYNCHONELLA (Gr. rhugchos, nose or beak). A genus of Brachiopods.
RODENTIA (Lat. rodo, I gnaw). An order of the Mammals; often called Glires (Lat. glis, a dormouse).
ROTALIA (Lat. rota, a wheel). A genus of Foraminifera.
RUGOSA (Lat. rugosus, wrinkled). An order of Corals.
RUMINANTIA (Lat. ruminor, I chew the cud). The group of Hoofed Quadrupeds (Ungulata) which "ruminate" or chew the cud.

SARCODE (Gr. sarx, flesh; eidos, form). The jelly-like substance of which the bodies of the Protozoa are composed. It is an albuminous body containing oil-granules, and is sometimes called "animal protoplasm."
SAURIA (Gr. saura, a lizard). Any lizard-like Reptile is often spoken of as a "Saurian;" but the term is sometimes restricted to the Crocodiles alone, or to the Crocodiles and Lacertilians.
SAUROPTERYGIA (Gr. sauro; pterux, wing). An extinct order of Reptiles, called by Huxley Plesiosauria, from the typical genus Plesiosaurus.
SAURURÆ (Gr. saura; oura, tail). The extinct order of Birds comprising only the Archœopteryx.
SCANSORES (Lat. scando, I climb). The order of the Climbing Birds (Parrots, Woodpeckers, &c.)
SCAPHITES (Lat. scapha, a boat). A genus of the Ammonitidœ.
SCOLITHUS (Gr. skolex, a worm; lithos, a stone). The vertical burrows of sea-worms in rocks.
SCUTA (Lat. scutum, a shield). Applied to any shield-like plates; especially to those which are developed in the integument of many Reptiles.
SELACHIA or SELACHII (Gr. selachos, a cartilaginous fish, probably a shark). The sub-order of Elasmobranchii comprising the Sharks and Dog-fishes.
SEPIOSTAIRE. The internal shell of the Sepia, commonly known as the "cuttle-bone."
SEPTA. Partitions.
SERPENTIFORM. Resembling a serpent in shape.
SERTULARIDA (Lat. sertum, a wreath). An order of Hydrozoa.
SESSILE (Lat. sedo, I sit). Not supported upon a stalk or peduncle; attached by a base.
SETHÆ (Lat. bristles). Bristles or long stiff hairs.
SIGILLARIOIDS (Lat. sigilla, little images). A group of extinct plants of which Sigillaria is the type, so called from the seal-like markings on the bark.
SILICEOUS (Lat. silex, flint). Composed of flint.
SINISTRAL (Lat. sinistra, the left hand). Left-handed; applied to the direction of the spiral in certain shells, which are said to be "reversed."
SIPHON (Gr. a tube). Applied to the respiratory tubes in the Mollusca; also to other tubes of different functions.
SIPHONIA (Gr. siphon, a tube). A genus of fossil Sponges.
SIPHONOSTOMATA (Gr. siphon; and stoma, mouth). The division of Gasteropodous Molluscs in which the aperture of the shell is not "entire," but possesses a notch or tube for the emission of the respiratory siphon.
SIPHUNCLE (Lat. siphunculus, a little tube). The tube which connects together the various chambers of the shell of certain Cephalopoda (e.g., the Pearly Nautilus).
SIRENIA (Gr. seiren. a mermaid). The order of Mammalia comprising the Dugongs and Manatees.
SIVATHERIUM (Siva, a Hindoo deity; Gr. therion, beast). An extinct genus of Hoofed Quadrupeds.
SOLIDUNGULA (Lat. solidus, solid; ungula, a hoof). The group of Hoofed Quadrupeds comprising the Horse, Ass, and Zebra, in which each foot has only a single solid hoof. Often called Solipedia.
SPHENOPTERIS (Gr. sphen, a wedge; pteris, a fern). An extinct genus of ferns.
SPICULA (Lat. spicidum, a point). Pointed needle-shaped bodies.
SPIRIFERA (Lat. spira, a spire or coil; fero, I carry). An extinct genus of Brachiopods, with large spiral supports for the "arms."
SPIRORBIS (Lat. spira, a spire; orbis, a circle). A genus of tube-inhabiting Annelides, in which the shelly tube is coiled into a spiral disc.
SPONGIDA (Gr. spoggos, a sponge). The division of Protozoa commonly known as sponges.
STALACTITES (Gr. stalasso, I drop). Icicle-like encrustations and deposits of lime, which hang from the roof of caverns in limestone.
STALAGMITE (Gr. stalagma, a drop). Encrustations of lime formed on the floor of caverns which are hollowed out of limestone.
STIGMARIA (Gr. stigma, a mark made with a pointed instrument). A genus founded on the roots of various species of Sigillaria.
STRATUM (Lat. stratus, spread out; or stratum, a thing spread out). A layer of rock.
STROMATOPORA (Gr. stroma, a thing spread out; paras, a passage or pore). A Palæozoic genus of Protozoa.
STROPHOHENA (Gr. strophao, I twist; mené, moon). An extinct genus of Brachiopods.
SUB-CALCAREOUS. Somewhat calcareous.
SUB-CENTRAL. Nearly central, but not quite.
SUTURE (Lat. suo, I sew). The line of junction of two parts which are immovably connected together. Applied to the line where the whorls of a univalve shell join one another; also to the lines made upon the exterior of the shell of a chambered Cephalopod by the margins of the septa.
SYRINGOPORA (Gr. surigx, a pipe; poros, a pore). A genus of Tabulate Corals.

TABULÆ. (Lat. tabula, a tablet). Horizontal plates or floors found in some Corals, extending across the cavity of the "theca" from side to side.
TEGUMENTARY (Lat. tegumentum, a covering). Connected with the integument or skin.
TELEOSAURUS (Gr. teleios, perfect; saura, lizard). An extinct genus of Crocodilian Reptiles.
TELEOSTEI (Gr. teleios, perfect; osteon, bone). The order of the "Bony Fishes."
TELSON (Gr. a limit). The last joint in the abdomen of Crustacea; variously regarded as a segment without appendages, or as an azygous appendage.
TENTACULITES (Lat. tentaculum, a feeler). A genus of Pteropoda.
TEREBRATULA (Lat. terebratus, bored or pierced). A genus of Brachiopoda, so called in allusion to the perforated beak of the ventral valve.
TEST (Lat. testa, shell). The shell of Mollusca, which are for this reason sometimes called "Testacea;" also, the calcareous case of Echinoderms; also, the thick leathery outer tunic in the Tunicata.
TESTACEOUS. Provided with a shell or hard covering.
TESTUDINIDÆ (Lat. testudo, a tortoise). The family of the Tortoises.
TETRABRANCHIATA (Gr. tetra, four; bragchia, gill). The order of Cephalopoda characterised by the possession of four gills.
TEXTULARIA. (Lat. textilis, woven). A genus of Foraminifera.
THECA (Gr. theké, a sheath). A genus of Pteropods.
THECODONTOSAURUS (Gr. theké, a sheath; odous, tooth; saura, lizard). A genus of "Thecodont" Reptiles, so named in allusion to the fact that the teeth are sunk in distinct sockets.
THERIODONT (Gr. therion, a beast; odous, tooth). A group of Reptiles so named by Owen in allusion to the Mammalian character of their teeth.
THORAX (Gr. a breastplate). The region of the chest.
THYLACOLEO (Gr. thulakos, a pouch; leo, a lion). An extinct genus of Marsupials.
TRIGONIA (Gr. treis, three; gonia, angle). A genus of Bivalve Molluscs.
TRIGONOCARPON (Gr. treis, three; gonia. angle; karpos, fruit). A genus founded on fossil fruits of a three-angled form.
TRILOBITA (Gr. treis, three; lobos, a lobe). An extinct order of Crustaceans.
TRINUCLEUS (Lat. tris, three; nucleus, a kernel). A genus of Trilobites.
TROGONTHERIUM (Gr. trogo, I gnaw; therion, beast). An extinct genus of Beavers.
TUBICOLA (Lat. tuba, a tube; and colo, I inhabit). The order of Annelida which construct a tubular case in which they protect themselves.
TUBICOLOUS. Inhabiting a tube.
TUNICATA (Lat. tunica, a cloak). A class of Molluscoida which are enveloped in a tough leathery case or "test."
TURBINATED (Lat. turbo, a top). Top-shaped; conical with a round base.
TURRILITES (Lat, turris, a tower). A genus of the Ammonitidœ.

UMBO (Lat. the boss of a shield). The beak of a bivalve shell.
UNGUICULATE (Lat. unguis, nail). Furnished with claws.
UNGULATA (Lat. ungula, hoof). The order of Mammals comprising the Hoofed Quadrupeds.
UNGULATE. Furnished with expanded nails constituting hoofs.
UNILOCULAR (Lat. unus, one; and loculus. a little purse). Possessing a single cavity or chamber. Applied to the shells of Foraminifera and Mollusca.
UNIVALVE (Lat. unus, one; valvœ, folding-doors). A shell composed of a single piece or valve.
URODELA (Gr. oura, tail; delos, visible). The order of the Tailed Amphibians (Newts, &c.)

VENTRAL (Lat. venter, the stomach). Relating to the inferior surface of the body.
VENTRICULITES (Lat. ventriculum, a little stomach). A genus of siliceous Sponges.
VERMIFORM (Lat. vermis, worm; and forma, form). Worm-like.
VERTEBRA (Lat. verto, I turn). One of the bony segments of the vertebral column or backbone.
VERTEBRATA (Lat. vertebra, a bone of the back, from vertere, to turn). The division of the Animal Kingdom roughly characterised by the possession of a backbone.
VESICLE (Lat. vesica, a bladder). A little sac or cyst.

WHORL. The spiral turn of a univalve shell.

XIPHOSURA (Gr. xiphos, a sworn; and oura, tail). An order of Crustacea, comprising the Limuli or King-Crabs, characterised by their long sword-like tails.
XYLOBIUS (Gr. xulon, wood; bios, life). An extinct genus of Myriapods, named in allusion to the fact that the animal lived on decaying wood.

ZAPHRENTIS (proper name). A genus of Rugose Corals.
ZEUGLODONTIDÆ. (Gr. zeuglé, a yoke; odous, a tooth). An extinct family of Cetaceans, in which the molar teeth are two-fanged, and look as if composed of two parts united by a neck.
ZOOPHYTE (Gr. zoön, animal; phuton, plant). Loosely applied to many plant-like animals, such as Sponges, Corals, Sea-anemones, Sea-mats, &c.

INDEX.

Acadian Group, 79.
Acer, 308.
Acervularia, 119, 173.
Acidaspis, 123.
Acorn-shells, 267.
Acroculia, 128.
Acrodus, 214, 242, 275; nobilis, 242.
Acrotreta, 110.
Acroura, 120.
Actinocrinus, 175.
Æglina, 108.
Æpiornis, 348.
Agnostus, 85-87, 108; rex, 85.
Alces malchis, 354.
Alecto, 108.
Alethopteris, 136, 165, 196.
Algœ (see Sea-weeds).
Alligators, 218, 297.
Alnus, 262.
Amblypterus, 188; macropterus, 188.
Ambonychia, 111.
Ammonites, 187, 212-214, 237-239, 272; Humpresianus, 238; bifrons, 238.
Ammonitidœ, 239, 272, 285, 294.
Amphibia, 189; of the Carboniferous, 189-191; of the Permian, 200; of the Trias, 215-217; of the Jurassic, 242; of the Miocene, 313.
Amphicyon, 322.
Amphilestes, 253.
Amphispongia, 118.
Amphistegina, 311.
Amphitherium, 253, 255; Prevostii, 254.
Amphitragulus, 317.
Amplexus, 173; coralloides, 174.
Ampyx, 108.
Anachytes, 266.
Anchitherium, 301-302.
Ancyloceras, 272, 273; Matheronianus, 273.
Ancylotherium Pentelici, 315.
Andrias Scheuchzeri, 313, 314.
Angiosperms, 261, 262.
Animal Kingdom, divisions of, 375-378.
Anisopus, 206.
Annelida, of the Cambrian period, 82, 83; of the Lower Silurian, 107; of the Upper Silurian, 122, 123; of the Devonian, 143, 144; of the Carboniferous, 178.
Annularia, 137, 196, 207.
Anomodontia, 220.
Anoplotheridœ, 302.
Anoplotherium, 302, 303; commune, 303.
Ant-eaters, 299, 315, 349, 350, 353.
Antelopes, 317.
Anthracosaurus Russelli, 190.
Anthrapalœmon gracilis, 180.
Antilocapra, 318.
Antilope quadricornis, 318.
Antwerp Crag, 325.
Apes, 323.
Apiocrinus, 231.
Apteryx, 346, 348.
Aqueous rocks, 15.
Arachnida of the Coal-measures, 181.
Aralo-Caspian Beds, 326.
Araucaria, 262.
Araucarioxylon, 170.
Arca, 198; antiqua, 199.
Archœocidaris, 178.
Archœocyathus, 82.
Archœopteryx, 252, 281; macrura, 252, 253.
Archœospœrinœ, 75.
Archimedes, 184; Wortheni, 183.
Archiulus, 182.
Arctic regions, Miocene flora of, 310.
Arctocyon, 304.
Arenaceous rocks, 20.
Arenicolites, 83; didymus, 88.
Arenig rocks, 92, 94.
Argillaceous rocks, 20.
Armadillos, 299, 351, 353.
Artiodactyle Ungulates, 300.
Asaphus, 108; tyrannus, 107, 108.
Ascoceras, 130.
Aspidella, 76.
Aspidura loricata, 210.
Astarte borealis, 338.
Asterophyllites, 137, 196.
Asterosteus, 152.
Astrœidœ, 231.
Astrœospongia, 118, 139.
Astylospongia, 98; prœmorsa, 139.
Athyris, 110, 127, 147, 198; subtilita, 185.
Atlantic Ooze, 22, 23.
Atrypa, 127; congesta, 127; hemispœrica, 127; reticularis, 147, 148.
Auger-shells, 293.
Aurochs, 356.
Aves (see Birds).
Avicula, 235; cantorta, 211, 212; socialis, 211.
"Avicula contorta Beds", 204, 212.
Aviculidœ, 198, 269.
Aviculopecten, 186.
Axophyllum, 173.
Aymestry Limestone, 116, 117.
Azoic rocks, 67.

Baculites, 273; anceps, 274.
Bagshot and Bracklesham Beds, 287.
Bakewellia, 198.
Balœna, 315.
Bala Group, 93, 94.
Bala Limestone, 93.
Balanidœ, 267.
Banksia, 262, 308.
Barbadoes Earth, 33.
Barnacles, 267.
Bath Oolite, 227.
Bats, 304, 322.
Bears, 330, 359.
Beaver, 322, 336.
Beetles, 182, 311.
Belemnitella mucronata, 275.
Beleminites, 214, 240, 274; canaliculatus, 241.
Belemnitidœ, 240, 285.
Belemnoteuthis, 240.
Belinurus, 179.
Bellerophon, 111, 129, 148, 186; Argo, 111.
Belodon, 218; Carolinensis, 219.
Belosepia, 295.
Beloteuthis subcostata, 239, 240.
Bembridge Beds, 288.
Beryx, 276; Lewesiensis, 276.
Beyrichia, 107; complicata, 107.
Bird's-eye Limestone, 95, 96.
Birds, of the Trias, 222; of the Jurassic, 251-253; of the Cretaceous, 281, 282; of the Eocene, 297; of the Post-Pliocene, 345-348.
Bison priscus, 356.
Bituminous Schists of Caithness, 36.
Bivalves (see Lamellibranchiata).
Black-lead (see Graphite).
Black-River Limestone, 95, 96.
Blastoidea, 176; of the Devonian, 143; of the Carboniferous, 176.
Boidœ, 296.
Bolderberg Beds, 307.
Bone-bed, of the Upper Ludlow, 116; of the Trias, 224.
Bony Fishes (see Teleostean Fishes).
Bos primigenius, 356; taurus, 356.
Boulder-clay, 337.
Bourgueticrinus, 266.
Bovey-Tracy Beds, 305, 309.
Brachiopoda, 125; of the Cambrian rocks, 87; of the Lower Silurian, 108-110; of the Upper Silurian, 125-128; of the Devonian, 147, 148; of the Carboniferous, 184-186; of the Permian, 198; of the Trias, 211; of the Jurassic, 234; of the Cretaceous, 268; of the Eocene, 292.
Brachymetopus, 179.
Brachyurous Crustaceans, 180, 197.
Bradford Clay, 227.
Breaks in the Geological and Palæontological record, 44-52.
Breccia, 19.
Brick-earths, 339.
Bridlington Crag, 325, 326, 336.
Brittle-stars (see Ophiuroidea).
Bronteus, 145.
Brontotheridœ, 316.
Brontotherium ingens, 316.
Brontozoum, 206.
Buccinum, 237.
Bucklandia, 230.
Bulimus, 294.
Bunter Sandstein, 203, 204, 206.
Butterflies, 233, 311.
Byssoarca, 198.