Valve elliptical-lanceolate; apices obtuse; median fissures distant; axial area narrow; central area large, orbicular; longitudinal lines close together, median.
Shark River, N. J.
Pl. [21], Fig. 5.
CALONEIS WARDII CL.
Valve linear, ends cuneate; axial area linear; central area dilated to a stauros reaching the margin; striæ parallel, radiate at the ends, 18 in 10 µ; longitudinal lines marginal.
Not uncommon in the Delaware River.
Pl. [21], Figs. 6 and 7.
CALONEIS POWELLII (LEWIS) CL.
Valve linear, with cuneate ends; axial area linear; central area large, quadrate, united to the wide longitudinal lines; striæ parallel, smooth, 8 in 10 µ.
Long Island (Lewis); Smith's Island, Delaware River.