| Fig. | | Page | | STAURONEIS—Continued | | 1 | Stauroneis phoenicenteron Ehr. | 88 | | 2 | Stauroneis acuta Wm. Sm. | 89 | | 3 | Stauroneis americana A. S. | 89 | | 4 | Stauroneis anceps var.? | 88 | | 5 | Stauroneis anceps var. gracilis (Ehr.) Cl. | 88 | | 6 | Stauroneis salina Wm. Sm. | 89 | | 7 | Stauroneis anceps var. amphicephala (Kuetz.) Cl. | 88 | | 8 | Stauroneis anceps var.? | 88 | | 9 | Stauroneis anceps var.? | 88 | | 10 | Stauroneis crucicula (Grun.) Cl. | 89 | | 11 | Stauroneis smithii Grun. | 89 | | NAVICULA | | 12 | Navicula lacustris Greg. | 92 | | 13 | Navicula hasta Pant. | 97 | | 14 | Navicula hasta var. punctata n. var. | 97 | | 15 | Navicula punctata var. asymmetrica Lagerstedt | 92 | | 16 | Navicula dicephala Wm. Sm. | 96 | | 17 | Navicula placenta Ehr. | 94 | | 18-19 | Navicula inflexa Greg. | 96 | | 20 | Navicula pinnata Pant.? | 96 | | 21 | Navicula oblonga Kuetz. | 97 | | 22 | Navicula pennata A. S. | 96 | | 23 | Navicula pygmÆa Kuetz. | 94 | | 24 | Navicula humilis Donk. | 96 | | | | Fig. | | Page | | STAURONEIS—Continued | | 1 | Stauroneis phoenicenteron Ehr. | 88 | | 2 | Stauroneis acuta Wm. Sm. | 89 | | 3 | Stauroneis americana A. S. | 89 | | 4 | Stauroneis anceps var.? | 88 | | 5 | Stauroneis anceps var. gracilis (Ehr.) Cl. | 88 | | 6 | Stauroneis salina Wm. Sm. | 89 | | 7 | Stauroneis anceps var. amphicephala (Kuetz.) Cl. | 88 | | 8 | Stauroneis anceps var.? | 88 | | 9 | Stauroneis anceps var.? | 88 | | 10 | Stauroneis crucicula (Grun.) Cl. | 89 | | 11 | Stauroneis smithii Grun. | 89 | | NAVICULA | | 12 | Navicula lacustris Greg. | 92 | | 13 | Navicula hasta Pant. | 97 | | 14 | Navicula hasta var. punctata n. var. | 97 | | 15 | Navicula punctata var. asymmetrica Lagerstedt | 92 | | 16 | Navicula dicephala Wm. Sm. | |   |
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