PLATE 23
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| Fig. | Page | |
| GYROSIGMA | ||
| 1 | Gyrosigma strigilis (Wm. Sm.) Cl. | [76] |
| 2 | Gyrosigma balticum (Ehr.) Cl. | [75] |
| 3 | Gyrosigma hippocampus (Ehr.) | [75] |
| 4 | Gyrosigma simile (Grun.) | [76] |
| 5 | Gyrosigma acuminatum (Kuetz.) Cl. | [76] |
| 6 | Gyrosigma scalproides (Rab.) Cl. | [76] |
| 7 | Gyrosigma parkeri var. stauroneioides Grun. | [75] |
| 8 | Gyrosigma spencerii var. nodifera Grun. | [76] |
| 9 | Gyrosigma fasciola (Ehr.) Cl. | [77] |
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PLATE 24
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| Fig. | Page | |
| NAVICULA | ||
| 1 | Navicula maculata (Bail.) Cl. | [90] |
| 2 | Navicula prætexta Ehr. | [92] |
| 3 | Navicula latissima Greg. | [90] |
| 4 | Navicula irrorata Grev. | [93] |
| 5 | Navicula latissima var. elongata (Pant.) Cl. | [91] |
| 6 | Navicula fuchsii Pant. | [91] |
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PLATE 25
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| Fig. | Page | |
| NAVICULA | ||
| 1 | Navicula tumida (Bréb.) Cl. | [99] |
| 2 | Navicula brasiliensis var. bicuneata Cl. forma constricta. | [92] |
| 3 | Navicula delawarensis Grun. | [92] |
| 4-6 | Navicula pusilla Wm. Sm. | [91] |
| 5 | Navicula humerosa Bréb. | [91] |
| 7 | Navicula spectabilis var. emarginata Cl. | [94] |
| 8 | Navicula pusilla var. subcapitata n. var. | [91] |
| 9 | Navicula punctulata Wm. Sm. | [92] |
| 10 | Navicula lyra Ehr. | [93] |
| 11 | Navicula hennedyi var. manca A. S. | [93] |
| 12 | Navicula hennedyi Wm. Sm. | [93] |
| 13 | Navicula lyra var. dilatata A. S. | [93] |
| 14 | Navicula yarrensis Grun. | [101] |
| 15 | Navicula yarrensis Grun. (smaller form) | [101] |
| 16 | Navicula yarrensis Grun. var.? | [101] |
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