Pl. [31], Figs. 15 and 21.
EPITHEMIA ARGUS VAR. ?
Valve strongly arcuate on the dorsal side and concave on the ventral; tapering to the rounded but not produced ends; costæ at unequal distances, about 2 in 10 µ; granules in transverse rows, 8 in 10 µ. L. 100 µ.
Pensauken, N. J., artesian well.
Pl. [31], Fig. 16.
EPITHEMIA MUELLERI A. S. ?
Valve broad, convex, slightly arcuate, with obtuse, somewhat constricted apices; costæ about 4 in 10 µ; striæ, 12-14 in 10 µ; in zone view the outline is rectangular, slightly tumid in the middle. L. 78 µ.
Blue clay.
Pl. [31], Fig. 17.
EPITHEMIA ZEBRA VAR. PROBOSCIDEA (KUETZ.) GRUN.