Frustule lanceolate, truncate; zone with numerous divisions. Valve arcuate on the dorsal and nearly straight on the ventral side; ends protracted or slightly capitate.
A. aponina Kuetz.
A. salina Wm. Sm.
Along the coast.
Pl. [15], Figs. 8 and 18.
Oxyamphora
AMPHORA LINEOLATA EHR.
Frustule membranaceous, elliptical, truncate, with broad ends. Zone with numerous divisions. Dorsal part striated transversely; ventral side with longitudinal lines.
A. plicata Greg.
A. hyalina H. L. Smith, Type No. 64.