| Fig. | | Page | | PINNULARIA—Continued | | 1 | Pinnularia gentilis (Donk.) Cl. | 103 | | 2 | Pinnularia viridis Nitzsch. | 104 | | 3 | Pinnularia dactylus var. dariana (A. S.) Cl. | 103 | | 4 | Pinnularia viridis var. fallax Cl. | 104 | | 5 | Pinnularia socialis Palmer | 104 | | 6 | Pinnularia Æstuarii Cl. | 105 | | 7 | Pinnularia rectangulata (Greg.) Cl. | 110 | | 8 | Pinnularia trigonocephala Cl. | 103 | | 9 | Pinnularia major (Kuetz.) Wm. Sm. (small form near P. viridis) | 102 | | 10 | Pinnularia dactylus var. demerarÆ Cl. | 103 | | 11 | Pinnularia mormonorum (Grun.) | 107 | | 12 | Pinnularia brÉbissonii (Kuetz.) Cl. | 107 | | 13 | Pinnularia mesolepta Ehr. | 105 | | 14 | Pinnularia termes var. stauroneiformis V. H. | 106 | | 15 | Pinnularia molaris (Grun.) Cl. | 105 | | 16 | Pinnularia braunii Grun. | 106 | | 17 | Pinnularia termes (Ehr.) A. S. | 106 | | 18 | Pinnularia appendiculata (Ag.) Cl. | 106 | | 19 | Pinnularia microstauron (Ehr.) Cl. var.? | 106 | | 20 | Pinnularia subcapitata Greg. | 105 | | | | Fig. | | Page | | PINNULARIA—Continued | | 1 | Pinnularia gentilis (Donk.) Cl. | 103 | | 2 | Pinnularia viridis Nitzsch. | 104 | | 3 | Pinnularia dactylus var. dariana (A. S.) Cl. | 103 | | 4 | Pinnularia viridis var. fallax Cl. | 104 | | 5 | Pinnularia socialis Palmer | 104 | | 6 | Pinnularia Æstuarii Cl. | 105 | | 7 | Pinnularia rectangulata (Greg.) Cl. | 110 | | 8 | Pinnularia trigonocephala Cl. | 103 | | 9 | Pinnularia major (Kuetz.) Wm. Sm. (small form near P. viridis) | 102 | | 10 | Pinnularia dactylus var. demerarÆ Cl. | 103 | | 11 | Pinnularia mormonorum (Grun.) | 107 | | 12 | Pinnularia brÉbissonii (Kuetz.) Cl. | 107 | | 13 | Pinnularia mesolepta Ehr. | 105 | | 14 | Pinnularia termes var. stauroneiformis V. H. | 106 | | 15 | Pinnularia molaris (Grun.) Cl. | 105 | | 16 | Pinnularia braunii Grun. | 106 | | 17 | Pinnularia termes (Ehr.) A. S. | 106 | | 18 | Pinnularia appendiculata (Ag.) Cl. | 106<
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