Common in the blue clay and along the coast.
Pl. [2], Figs. 14 and 20.
Fig. 20 is probably var. perpusilla Grun. (Diat. Fr. Jos. L., Pl. 4 (D), Fig. 7).
LINEATI
COSCINODISCUS LINEATUS EHR.
Valve circular, markings hexagonal, cells in parallel rows. Border narrow, cellular.
Blue clay and Atlantic coast. Not common.
Pl. [3], Fig. 8.
FASCICULATI
COSCINODISCUS NITIDUS GREG.