The Diatomaceæ of Philadelphia and Vicinity

by Charles S. Boyer

PLATE 6

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]

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]