Megalaspis attenuata Wahlenb.

Fig.  1.  Horizontal section of cephalic eye near the inferior margin 60/1.
a surface of the eye, b frame with irregular or
reserve prisms, c part of the cheek with normal
structure. Spec. DP.
»     2.  Hypostoma 2/1. Spec. BM.
»     3.  The right macula 12/1.
»     4.  Part of the same in transmitted light 60/1. Spec. DR.
»     5.  Vertical (sagittal) section of the inferior part of the
hypostoma, crossing the macula a 12/1.
»     6.  Vertical section of the same macula 60/1. All spec. from
Westanå, Östergötland.

Megalaspis limbata Boeck p. 61.

Fig.  7.  Hypostoma, mostly decorticated 2/1. Specimen from Fogelsång,
Scania, the same as Brögger's original to his
fig. 23.

Megalaspis planilimbata Angel. p. 61.

Fig.  8.  Hypostoma, Öland, Äleklinta 2/1.

Megalaspis sp.

Fig.  9.  Vertical section of macula (a) 12/1. Öland, Lower
grey Orthoc. limestone.

Nileus armadillo Dalm. p. 62.

Fig.  10.  Horizontal section of cephalic eye 60/1.
»    11.  Vertical section of the same 60/1.
»    12.  A similar section 60/1. a the prisms of clear
calcareous spar, b the surface of the eye and
the free cheek of yellow spar.
»    13.  The hypostoma 2/1.
»    14.  The right macula 12/1.
»    15.  Vertical section of macula (a) 12/1. All specimens
from Persnäs, Öland, excepting fig. 13 from Westanå,
Östergötland.

Symphysurus palpebrosus Dalman p. 62.

Fig.  16.  Horizontal section of cephalic eye 60/1.
»    17.  Vertical section of the same 60/1.
»    18.  Hypostoma 2/1. From Westanå, Östergötland.

Niobe frontalis Ang. p. 63.

Fig.  19.  The hypostoma 2/1.
»    20.  The right macula 10/1.
»    21.  Part of the same in transmitted light 60/1.
Specimen  from Kungs Norrby, Östergötland.

Niobe læviceps Ang. p. 63.

Fig.  22.  Horizontal section of cephalic eye near the inferior margin,
a cheek 60/1.
»    23.  Hypostoma 2/1.
»    24.  The right macula 10/1.
»    23.  Part of the same in transmitted light 60/1.
»    26.  Vertical section of macula a 12/1.

Ogygia dilatata var. Sarsi Angel. p. 63.

Fig.  27.  Hypostoma 2/1.
»    28.  The right macula 10/1. From Christiania, Haakavik, Collection
of Dr. G. Holm.

Olenus sp. p. 33.

Fig.  29.  A part of the free cheek with the scallop 6/1.
»    30.  Profile of the scallop. Andrarum, Scania.

Parabolina spinulosa Wahlenb. p. 33.

Fig.  31.  The free cheek with the scallop 3/1.
»    32.  Profile of the scallop. From Jemtland.

Paradoxides oelandicus Angel. p. 64.

Fig.  33.  Hypostoma 2/1.
»    34.  The left macula 12/1. Öland, Torp.

Phacops cephalotes Barr. p. 65.

Fig.  35.  The hypostoma; the shell mostly decorticated and the
maculæ visible as casts on the inside.
»    36.  Cast of the inside of the right macula 12/1. Spec. from
Lochkow, Bohemia.

Phacops quadrilineata Angel. p. 66.

Fig.  37.  Horizontal section of cephalic eye near the inferior margin
30/1. The dark points lie in the outermost stratum of the
cheek.
»    38.  Vertical section of cephalic eye 20/1. An irregularly
hexaedral crystal below each lens. Specimen from Wisby a.

Phacops macrophthalmus Burm. p. 65

Fig.  1.  Horizontal section of the cephalic eye 30/1.
»     2.  A similar one near the inferior margin, a cheek 30/1.
»     3.  Vertical section of a cephalic eye 30/1.
»     4.  A similar, twice as much enlarged 60/1.
»     5.  Also a similar, a cheek 30/1.
»     6.  Hypostoma 2/1. Spec. EA.
»     7.  The wings of the hypostoma, seen without foreshortening
4/1. EA.
»     8.  The diminutive right macula 12/1, surrounded by incoherent
terrace lines.
»     9.  The left macula 12/1. Specimens from Gerolstein Eifel, Devon.

Acaste sp.? p. 51.

Fig.  10.  The hypostoma 8/1. From Mulde, Fröjel, Gotland.

Phaëtonides Stokesi Murch. p. 66.

Fig.  11.  Hypostoma 4/1. Gotland, Eksta, Djupvik.

Phillipsia sp. p. 66.

Fig.  12.  A portion of the cephalic eye 20/1.
»    13.  The hypostoma 4/1.
»    14.  The right macula 12/1. Specimen from Beeren Eiland, Oswalds
förberg, communicated by Hr. J. G. Andersson.

Phillipsia sp.? p. 66.

Fig.  16.  The hypostoma 3/1.
»    16.  The right macula 12/1.
»    17.  Horizontal section of the cephalic eye 60/1.
»    18.  Vertical section of the cephalic eye, a cheek 60/1.
Probably from the Carbon of Belgium.

Proetus concinnus Dalm. p. 67.

Fig.  19.  Horizontal section of the cephalic eye, a little oblique, at
right the innermost stratum with the rock 60/1.
»    20.  Vertical section of the cephalic eye. The diameter of the
prisms 0,03 millim.
»    21.  Hypostoma 4/1.
»    22.  The right macula 12/1.
»    23.  The same with a light, transparent spot 12/1. Specimen
from Djupvik, Eksta.

Proetus conspersus Ang. p. 68.

Fig.  24.  A portion of the cephalic eye 20/1.
»    25.  The hypostoma. Cast of the interior side 4/1.
»    26.  Cast of the interior side of the left macula 12/1.
Fig. 24 from Öja, Gotland, the others from Kräklingbo.

Proetus signatus Ldm. p. 68.

Fig.  27.  Hypostoma 4/1.
»    28-30.  Three pair of maculæ with dark ocelli in a white spot.

Ptychopyge angustifrons Dalm. p. 69.

Fig.  31.  Horizontal section of the cephalic eye 250/1.
»    32.  Hypostoma, a broad variety 1/1.
»    33.  Another, a narrow variety 1/1.
»    34.  The left macula of the hypostoma fig. 32 4/1.
»    35.  A similar of the narrow variety 4/1.
»    36.  Vertical section of a macula. a the macula 20/1.
Specimens from Vestanå and Kungs Norrby, Östergötland.

Ptychopyge cincta Brögger p. 69

(according to Fr. Schmidt. The figure 12 a of Brögger resembles, however, the hypostoma of Pt. angustifrons, but not the hypostomata which have been prepared from the Ptych. cincta).

Fig.  37.  A hypostoma; the maculæ are directed obliquely 2/1.
»    38.  The right macula of another specimen 4/1.
»    39.  Vertical section of a macula 60/1. Specimens from Kungs
Norrby, Östergötland.

Ptychopyge aciculata Ang. p. 68.

(Compare Brögger II Taf. I, fig. 13.)

Fig.  40.  The hypostoma, cast of the interior surface 1/1.
»    41.  Cast of the right macula 4/1. Specimen from Öland, Brunsby.

Ptychopyge glabrata Ang. p. 69.

Fig.  42.  Original of Brögger's fig. 14. Cast of the inside of
the right macula 4/1. Ǎlleberg.

Elyx laticeps Ang. p. 19.

Fig.  43.  The interior surface of the right fixed cheek and the
glabella. Magnified. Specimen from Andrarum. 4/1.

Conocoryphe p. 19.

Fig.  44.  Cast of the interior surface of the left cheek. Magnified.
From Andrarum. 4/1.

Solenopleura brachymetopa Angel. p. 19.

Fig.  45.  The head shield, cast of the interior surface. Magnified.
Specimen from Andrarum, Scania. 4/1.

Apus cancriformis Schäffer p. 73.

Fig.  46.  The hypostoma from the outside 8/1.
»    47.  The same from the inside 8/1.
»    48.  A side view of the same, 8/1. a the duplicature of the
head shield, b posterior integument of the hypostoma,
c the ventricle, d the mouth.
»    49.  The right white spot at the posterior margin of the hypostoma,
seen from the outside in transmitted light 150/1.