OPEPHORA SCHWARTZII (GRUN.) PETIT
Valve obovate-lanceolate or nearly linear with rounded apices; striæ transverse, broad, 3 or 4 in 10 µ; median area lanceolate.
An inner stratum, with puncta in transverse rows, is apparent.
Blue clay. Not uncommon. Variable in size.
Pl. [10], Figs. 16 and 19.
OPEPHORA PACIFICA (GRUN.) PETIT
Valve linear, oblong, with rounded apices. Median area linear, narrow; striæ punctate.
Blue clay.
Pl. [10], Fig. 18.
Petit (Diat. Cap Horn) in his diagnosis states that the valves are cuneiform, but they are not always so.