| 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 boeckii (Kuetz.) Grun. | 79 | | 8 | BrÉbissonia palmerii n. sp. | 80 | | AMPHIPLEURA | | 9 | Amphipleura pellucida Kuetz. | 78 | | 10-11 | Amphipleura rutilans (Trentepohl) Cl. | 78 | | ANOMŒONEIS | | 12 | Anomoeoneis serians (BrÉb.) Cl. | 80 | | 13 | Anomoeoneis serians forma minor | 80 | | 14 | Anomoeoneis 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 | | | | 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 boeckii (Kuetz.) Grun. | 79 | | 8 | BrÉbissonia palmerii n. sp. | 80 | | AMPHIPLEURA | | 9 | Amphipleura pellucida Kuetz. | 78 | | 10-11 | Amphipleura rutilans (Trentepohl) Cl. | 78 | | ANOMŒONEIS | | 12 | Anomoeoneis serians (BrÉb.) Cl. | 80 | | 13 | Anomoeoneis serians forma minor | 80 | | 14 | Anomoeoneis follis (Ehr.) Cl. | 80 | | TRACHYNEIS | | 15 | Trachyneis aspera var. intermedia Grun. | 70 | |   |
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