The Diatomaceæ of Philadelphia and Vicinity

PLATE 6

Reading edition

Fig. Page ACTINOCYCLUS 1 Actinocyclus barkleyi var. aggregata Rattr. 27 2 Actinocyclus moniliformis Ralfs. 27 BIDDULPHIA 3 Biddulphia antediluviana (Ehr.) V. H. 32 5 Biddulphia reticulum (Ehr.) 33 6 Biddulphia favus (Ehr.) V. H. 31 7-8 Biddulphia alternans (Bail.) V. H. 33 TRINACRIA 9 Trinacria pileolus (Ehr.) Grun. 30 DITYLUM 4 Ditylum intricatum (West) Grun. 30 TERPSINOË 10 Terpsinoë americana (Bail.) Ralfs. 34 11 Terpsinoë novæ-cæsareæ Boyer 34

Illustration from The Diatomaceæ of Philadelphia and Vicinity

Fig. Page

ACTINOCYCLUS

1 Actinocyclus barkleyi var. aggregata Rattr. 27

2 Actinocyclus moniliformis Ralfs. 27

BIDDULPHIA

3 Biddulphia antediluviana (Ehr.) V. H. 32

5 Biddulphia reticulum (Ehr.) 33

6 Biddulphia favus (Ehr.) V. H. 31

7-8 Biddulphia alternans (Bail.) V. H. 33

TRINACRIA

9 Trinacria pileolus (Ehr.) Grun. 30

DITYLUM

4 Ditylum intricatum (West) Grun. 30

TERPSINOË

10 Terpsinoë americana (Bail.) Ralfs. 34

11 Terpsinoë novæ-cæsareæ Boyer 34