| 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 | | | | 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 | |
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