The Diatomaceæ of Philadelphia and Vicinity

PLATE 37

Reading edition

Fig. Page CYMATOPLEURA 1 Cymatopleura elliptica (Bréb.) Wm. Sm. 129 2 Cymatopleura elliptica forma spiralis 129 3-4 Cymatopleura marina Lewis 129 CAMPYLODISCUS 5 Campylodiscus hibernicus Ehr. 130 6 Campylodiscus echeneis Ehr. 130

Illustration from The Diatomaceæ of Philadelphia and Vicinity

Fig. Page

CYMATOPLEURA

1 Cymatopleura elliptica (Bréb.) Wm. Sm. 129

2 Cymatopleura elliptica forma spiralis 129

3-4 Cymatopleura marina Lewis 129

CAMPYLODISCUS

5 Campylodiscus hibernicus Ehr. 130

6 Campylodiscus echeneis Ehr. 130