The Diatomaceæ of Philadelphia and Vicinity

PLATE 22

Reading edition

Fig. Page PLEUROSIGMA 1 Pleurosigma strigosum Wm. Sm. 74 2 Pleurosigma rigidum Wm. Sm. 75 3 Pleurosigma angulatum (Quekett) Cl. 74 4 Pleurosigma obscurum Wm. Sm. 74 5 Pleurosigma formosum Wm. Sm. 73 6 Pleurosigma naviculaceum Bréb. 74 7 Pleurosigma æstuarii Bréb. 74 8 Pleurosigma virginiacum H. L. Smith 74

Illustration from The Diatomaceæ of Philadelphia and Vicinity

Fig. Page

PLEUROSIGMA

1 Pleurosigma strigosum Wm. Sm. 74

2 Pleurosigma rigidum Wm. Sm. 75

3 Pleurosigma angulatum (Quekett) Cl. 74

4 Pleurosigma obscurum Wm. Sm. 74

5 Pleurosigma formosum Wm. Sm. 73

6 Pleurosigma naviculaceum Bréb. 74

7 Pleurosigma æstuarii Bréb. 74

8 Pleurosigma virginiacum H. L. Smith 74