Valve linear, slightly arcuate, narrow, with rounded apices somewhat revolute; striæ, 16 in 10 µ.
May's Landing, N. J.
Pl. [13], Fig. 27.
EUNOTIA PRÆRUPTA EHR.
Valve convex on dorsal side, apices dilated and truncate; striæ distant at centre.
Common in the blue clay.
Pl. [13], Fig. 5.
EUNOTIA PRÆRUPTA VAR. BIDENS GRUN.
Valve with two undulations; otherwise as in type.
Eunotia bigibba Greg.