Valve elliptic-lanceolate, ends rostrate-capitate. Axial area narrow, central area rounded, larger on one side of the median line than the other. Striæ very slightly radiate, 16 in 10 µ, punctate, the puncta interrupted by longitudinal blank lines.
Pfitzer states that the central plasma mass is unequal on the two sides.
Navicula sphærophora Kuetz.
Fresh and brackish water. Not common.
Pl. [40], Fig. 2.
ANOMŒONEIS SERIANS (BRÉB.) CL.
Valve lanceolate, acute; axial area lanceolate; striæ, 24 in 10 µ; puncta elongate.
Not common in this locality, but abundant northwards; fossil in the peat deposits of New England.
May's Landing, N. J.
Pl. [17], Fig. 12.