Pl. [15], Fig. 13.
AMPHORA ACUTA GREG.
Valve lunate, with acute ends; ventral margin straight; ventral side very narrow. Central nodule dilated to a stauros; striæ transverse, punctate.
Along the coast.
Pl. [15], Fig. 20.
Amblyamphora
AMPHORA OBTUSA GREG.
Frustule rectangular. Valve linear, obliquely rounded at the ends, with arcuate dorsal, and straight ventral, margin; median line biarcuate; striæ, 18-20 in 10 µ.
Along the coast. Common.
Pl. [15], Fig. 4.