Striæ, 14 in 10 µ, punctate, oblique in the middle, convergent at the ends; puncta, 15 in 10 µ. L. 238 µ.
Pensauken, N. J. (artesian well).
Pl. [21], Fig. 11.
Var. genuina forma minor Cl.—L. 26 µ; striæ, 24 in 10 µ.
Brandywine Creek.
Pl. [21], Fig. 12.
NEIDIUM AFFINE VAR. AMPHIRHYNCUS (EHR.) CL.
Valve linear, with protracted capitate ends; striæ transverse, interrupted by several longitudinal lines.
Willistown, Pa.
Pl. [21], Fig. 13.