Blue clay. Brackish water.
Pl. [34], Fig. 1.
In the specimen figured, the outline is exactly elliptical, although the species is usually conical at one end.
SURIRELLA GEMMA EHR.
Valve ovate or ovate-elliptical, rounded at each end, sometimes asymmetrical along the longitudinal axis; pseudoraphe very narrow; costæ distant, at irregular intervals, about 2 in 10 µ, somewhat radiate, reaching the pseudoraphe; striæ, 20 in 10 µ, punctate. Frustule in zone view cuneate. L. 70-120 µ.
Along the coast.
Pl. [36], Fig. 4.
SURIRELLA TENERA GREG.
Valve ovate; pseudoraphe narrow, well-defined; costæ indistinct, 2½ in 10 µ, their margins invisible; striæ about 14 in 10 µ, punctate, more evident near the margin. L. 90 µ.
Surirella diaphana Bleisch.