The Diatomaceæ of Philadelphia and Vicinity

PLATE 23

Reading edition

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

Illustration from The Diatomaceæ of Philadelphia and Vicinity

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