PLATE 7
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| Fig. | Page | |
| BIDDULPHIA | ||
| 1-2-3-4 | Biddulphia biddulphiana (Smith) | [31] |
| 5 | Biddulphia rhombus (Ehr.) Wm. Sm. | [32] |
| 6 | Biddulphia granulata Roper | [32] |
| 7 | Biddulphia turgida (Ehr.) Wm. Sm. | [32] |
| 8 | Biddulphia smithii (Ralfs) V. H. | [32] |
| 9 | Biddulphia lævis Ehr. | [33] |
| 10 | Biddulphia lævis Ehr. Sporangial frustules (260 diam.) | [33] |
| EUNOTOGRAMMA | ||
| 11 | Eunotogramma læve Grun. | [33] |
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