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| Fig. | Page | |
| ACHNANTHES | ||
| 1-2 | Achnanthes longipes Ag. | 58 |
| 3 | Achnanthes brevipes Ag. | 59 |
| 4-5-6 | Achnanthes subsessilis Kuetz. | 59 |
| 7-8 | Achnanthes inflata (Kuetz.) Grun. | 59 |
| 9 | Achnanthes coarctata (Bréb.) Grun. | 59 |
| 10-11-12 | Achnanthes lanceolata (Bréb.) Grun. | 59 |
| 13 | Achnanthes danica (Floegel) Grun. (lower valve) | 60 |
| 14-15 | Achnanthes exigua Grun. | 59 |
| 16-17 | Achnanthes linearis forma curta H. L. Smith | 59 |
| COCCONEIS | ||
| 18 | Cocconeis scutellum var.? | 57 |
| 19-20 | Cocconeis placentula Ehr. | 57 |
| 21 | Cocconeis scutellum Ehr. (upper valve) | 57 |
| 22 | Cocconeis dirupta Greg. (lower valve) | 58 |
| 23-24 | Cocconeis pediculus Ehr. | 57 |
| 25-26 | Cocconeis pellucida Grun. | 58 |
| 27-28 | Cocconeis scutellum var. ornata Grun. | 57 |
| 29 | Cocconeis placentula var. lineata (Ehr.) V. H. | 58 |
| ANORTHONEIS | ||
| 30-31 | Anorthoneis excentrica (Donk.) Grun. | 56 |
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| Fig. | Page | |
| FRUSTULIA | ||
| 1 | Frustulia lewisiana (Grev.) De Toni | 77 |
| 2 | Frustulia rhomboides (Ehr.) De Toni | 77 |
| 3 | Frustulia rhomboides var. amphipleuroides Grun. | 77 |
| 4 | Frustulia vulgaris (Thwaites) De Toni | 77 |
| 5 | Frustulia interposita (Lewis) De Toni | 78 |
| 6 | Frustulia rhomboides var. saxonica (Rab.) De Toni | 77 |
| BREBISSONIA | ||
| 7 | Brébissonia bœckii (Kuetz.) Grun. | 79 |
| 8 | Brébissonia palmerii n. sp. | 80 |
| AMPHIPLEURA | ||
| 9 | Amphipleura pellucida Kuetz. | 78 |
| 10-11 | Amphipleura rutilans (Trentepohl) Cl. | 78 |
| ANOMŒONEIS | ||
| 12 | Anomœoneis serians (Bréb.) Cl. | 80 |
| 13 | Anomœoneis serians forma minor | 80 |
| 14 | Anomœoneis follis (Ehr.) Cl. | 80 |
| TRACHYNEIS | ||
| 15 | Trachyneis aspera var. intermedia Grun. | 70 |
| MASTOGLOIA | ||
| 16 | Mastogloia kinsmanii Lewis | 87 |
| 17 | Mastogloia angulata Lewis | 87 |
| 18 | Mastogloia lanceolata Thwaites | 87 |
| 19 | Mastogloia smithii Thwaites | 87 |
| 20 | Mastogloia elegans Lewis | 87 |
| 21-22-23 | Mastogloia apiculata Wm. Sm. | 87 |
| 24 | Mastogloia exigua Lewis | 87 |
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| Fig. | Page | |
| CYMBELLA | ||
| 1 | Cymbella aspera (Ehr.) Cl. | 61 |
| 2 | Cymbella cymbiformis (Kuetz.) Bréb. | 62 |
| 3 | Cymbella cistula (Hempr.) Kirchn. | 62 |
| 4 | Cymbella lanceolata (Ehr.) Kirchn. | 62 |
| 5 | Cymbella mexicana (Ehr.) A. S. | 62 |
| 6 | Cymbella naviculiformis Auerswald. | 60 |
| 7 | Cymbella tumida (Bréb.) V. H. | 62 |
| 8 | Cymbella philadelphica n. sp. | 63 |
| 9 | Cymbella ehrenbergii Kuetz. | 60 |
| 10 | Cymbella heteropleura (Ehr.) Kuetz. | 60 |
| 11 | Cymbella rhomboidea n. sp. | 63 |
| 12 | Cymbella turgida (Greg.) Cl. var.? | 63 |
| 13 | Cymbella sinuata Greg. | 61 |
| 14 | Cymbella ventricosa Kuetz. | 62 |
| 15-19 | Cymbella excisa (Kuetz.) De Toni. | 61 |
| 16 | Cymbella amphicephala Nægeli. | 61 |
| 17 | Cymbella cuspidata Kuetz. | 60 |
| 18 | Cymbella affinis Kuetz. | 61 |
| 20 | Cymbella gracilis (Rab.) Cl. | 64 |
| 21 | Cymbella prostrata (Berk.) Cl. | 63 |
| 22 | Cymbella ventricosa Kuetz.? | 62 |
| 23 | Cymbella turgida (Greg.) Cl. | 63 |
| 24 | Cymbella triangulum (Ehr.) Cl. | 63 |
| 25 | Cymbella lacustris (Ag.) Cl. | 64 |
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| Fig. | Page | |
| GOMPHONEIS | ||
| 1 | Gomphoneis mamilla (Ehr.) Cl. | 70 |
| 2 | Gomphoneis herculaneum (Ehr.) Cl. | 70 |
| GOMPHONEMA | ||
| 3 | Gomphonema montanum Schum. | 71 |
| 4 | Gomphonema geminatum Lyng. | 71 |
| 5 | Gomphonema acuminatum var. turris (Ehr.) Cl. | 71 |
| 6-12 | Gomphonema lanceolatum var. insignis (Greg.) Cl. | 71 |
| 7 | Gomphonema acuminatum var. coronata (Ehr.) Cl. | 71 |
| 8 | Gomphonema constrictum Ehr. | 72 |
| 9-10 | Gomphonema sphærophorum Ehr. | 72 |
| 11 | Gomphonema acuminatum var. turris (Ehr.) Cl.? | 71 |
| 13 | Gomphonema ventricosum Greg. | 73 |
| 14 | Gomphonema intricatum Kuetz. | 72 |
| 15 | Gomphonema æquale Greg. | 72 |
| 16 | Gomphonema sarcophagus Greg. | 72 |
| 17 | Gomphonema parvulum var. micropus (Kuetz.) Cl. | 73 |
| 18-19 | Gomphonema angustatum Kuetz. | 72 |
| 20 | Gomphonema acuminatum var. trigonocephala (Ehr.) Cl. | 71 |
| 21 | Gomphonema augur Ehr. | 72 |
| 22 | Gomphonema capitatum Ehr. | 72 |
| 23 | Gomphonema olivaceum Lyng. | 73 |
| 24 | Gomphonema brasiliense var. demeraræ Grun.? | 73 |
| RHOICOSPHENIA | ||
| 25-26-27 | Rhoicosphenia curvata (Kuetz.) Grun. | 56 |
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| Fig. | Page | |
| DICTYONEIS | ||
| 1 | Dictyoneis marginata var. maxima n. var. | 79 |
| 2 | Dictyoneis marginata var. commutata Cleve. | 79 |
| 3 | Dictyoneis marginata var. typica Cleve. | 78 |
| DIPLONEIS | ||
| 4 | Diploneis crabro var. pandura (Bréb.) Cl. | 85 |
| 6 | Diploneis campylodiscus (Grun.) Cl. | 86 |
| 7-8 | Diploneis gruendleri (A. S.) Cl. | 85 |
| 9 | Diploneis crabro Ehr. var.? | 85 |
| 10 | Diploneis excentrica n. sp. | 85 |
| 11 | Diploneis fusca var. delicata (A. S.) Cl. | 85 |
| 12 | Diploneis puella (Schum.) Cl. | 85 |
| 13 | Diploneis crabro var. pandurella Cl.? | 85 |
| 14 | Diploneis elliptica (Kuetz.) Cl. | 84 |
| 15 | Diploneis crabro var. expleta (A. S.) Cl. | 85 |
| 16 | Diploneis geminata (Grev.) Cl. | 86 |
| 17 | Diploneis smithii (Bréb.) Cl. | 84 |
| NAVICULA | ||
| 5 | Navicula lyra Ehr. var.? | 93 |
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| Fig. | Page | |
| CALONEIS | ||
| 1 | Caloneis permagna (Bail.) Cl. | 82 |
| 2 | Caloneis permagna var. lewisiana n. var. | 82 |
| 3 | Caloneis silicula (Ehr.) Cl. | 81 |
| 4 | Caloneis silicula var. inflata (Grun.) Cl. | 81 |
| 5 | Caloneis brevis var. vexans (Grun.) Cl. | 82 |
| 6-7 | Caloneis wardii Cl. | 82 |
| 8 | Caloneis trinodis (Lewis) | 81 |
| 9 | Caloneis trinodis (Lewis) var.? | 81 |
| 10 | Caloneis powellii (Lewis) Cl. | 83 |
| 18 | Caloneis formosa (Greg.) Cl. | 82 |
| NEIDIUM | ||
| 11 | Neidium affine (Ehr.) Pfitzer | 83 |
| 12 | Neidium affine var. genuina forma minor Cl. | 83 |
| 13 | Neidium affine var. amphirhyncus (Ehr.) Cl. | 83 |
| 14 | Neidium amphigomphus (Ehr.) Pfitzer. | 83 |
| 15 | Neidium hitchcockii (Ehr.) Cl. | 84 |
| 16 | Neidium productum (Wm. Sm.) Cl. | 83 |
| 17 | Neidium iridus (Ehr.) Cl. | 84 |