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The Diatomaceæ of Philadelphia and Vicinity

PLATE 3

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Fig. Page COSCINODISCUS—Continued 1-11 Coscinodiscus radiatus Ehr. 23 2 Coscinodiscus velatus Ehr. 22 3 Coscinodiscus biangulatus A. S. 23 4 Coscinodiscus subaulacodiscoidalis Rattr. 23 5 Coscinodiscus lewisianus Grev. 24 7 Coscinodiscus argus Ehr. 23 8 Coscinodiscus lineatus Ehr. 21 9 Coscinodiscus marginatus Ehr. 22 10 Coscinodiscus oculus-iridis Ehr. 23 ACTINOCYCLUS 6 Actinocyclus ellipticus var. delawarensis n. var. 27

Illustration from The Diatomaceæ of Philadelphia and Vicinity

Fig. Page

COSCINODISCUS—Continued

1-11 Coscinodiscus radiatus Ehr. 23

2 Coscinodiscus velatus Ehr. 22

3 Coscinodiscus biangulatus A. S. 23

4 Coscinodiscus subaulacodiscoidalis Rattr. 23

5 Coscinodiscus lewisianus Grev. 24

7 Coscinodiscus argus Ehr. 23

8 Coscinodiscus lineatus Ehr. 21

9 Coscinodiscus marginatus Ehr. 22

10 Coscinodiscus oculus-iridis Ehr. 23

ACTINOCYCLUS

6 Actinocyclus ellipticus var. delawarensis n. var. 27

Illustration from The Diatomaceæ of Philadelphia and Vicinity
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