COCCONEIS DIRUPTA GREG.
Valves elliptical, the lower with fine puncta in slightly radiating lines, a narrow axial area and a central area dilated into a lanceolate, stauriform space; the terminal fissures turned in opposite directions; the upper valve similar to the lower valve except in the absence of raphe and nodules.
Along the coast. New Rochelle.
Pl. [16], Fig. 22 (lower valve).
COCCONEIS PELLUCIDA GRUN.
Valves elliptical, the upper with broad axial area on each side of which are fine, longitudinal rows of short striæ; the lower valve with more numerous longitudinal rows, a marginal line and indistinct raphe; the terminal fissures small and turned in opposite directions.
New Rochelle.
Pl. [16], Figs. 25 and 26.
In the var. minor Grun. the median line of the lower valve is sometimes slightly sigmoid.