Valve ovate-lanceolate; costæ about 2½ in 10 µ with punctate interspaces extending half the distance toward the median hyaline area, which is divided longitudinally on each side of the narrow pseudoraphe by two longitudinal bands composed of short, transverse, irregular, punctate lines.
Along the coast.
Pl. [36], Fig. 3.
Section 4 (Stenopterobia)
SURIRELLA ANCEPS LEWIS
Frustule linear, straight or nearly so; valve sigmoid with rounded apices; costæ marginal, nearly obsolete; striæ distinct, about 15 in 10 µ; pseudoraphe wide. L. to 320 µ.
Hammonton Pond and Tom's River, N. J.
Pl. [34], Fig. 2.
SURIRELLA INTERMEDIA LEWIS
Frustule linear, straight, widened at the truncate ends; valve linear, sigmoid, tapering to the sub-acute ends; costæ about 5 in 10 µ; striæ about 20 in 10 µ. L. variable.