The Diatomaceæ of Philadelphia and Vicinity

by Charles S. Boyer

Pavonia, N. J., artesian well.

Pl. [35], Fig. 6.

The figure is that of the var. nervosa A. S. (Atlas, Pl. 23, Fig. 15), which differs from the type in having the position of the costæ indicated by scattered puncta.

Section 2

SURIRELLA GUATIMALENSIS EHR.

Valve ovate; pseudoraphe very narrow and indistinct; costæ short, marginal, 2-2½ in 10 µ, absent from the rounded end. L. 120 µ.

Surirella cardinalis Kitton.

Smith's Island, Delaware River.

Pl. [36], Fig. 5.

SURIRELLA OVALIS BRÉB.