| Fig. | | Page |
| 1 | Nitzschia spectabilis var. americana Grun. (zone view) | [122] |
| 2 | Nitzschia panduriformis Greg. | [117] |
| 3 | Hantzschia amphioxys (Ehr.) Grun. | [113] |
| 4 | Hantzschia amphioxys var. major Grun. | [114] |
| 5 | Nitzschia dubia Wm. Sm. | [118] |
| 6 | Nitzschia amphioxys Wm. Sm. | [114] |
| 7 | Nitzschia compressa (Bail.) | [116] |
| 8 | Nitzschia compressa var. minor H. L. Smith | [116] |
| 9 | Surirella intermedia Lewis (zone view) | [128] |
| 10 | Surirella arctissima A. S. forma minor | [128] |
| 11 | Surirella ovalis Bréb. | [126] |
| 12 | Surirella biseriata (Ehr.) Bréb. | [124] |
| 13 | Nitzschia sigma (Kuetz.) Wm. Sm. | [121] |
| 14 | Nitzschia obtusa var. flexella H. L. Smith | [121] |
| 15 | Stauroneis legumen Ehr. | [89] |
| 16 | Nitzschia obtusa Wm. Sm. | [121] |
