Genus Megalasma Hoek, 1883

Megalasma Hoek, 1883: 50. - Pilsbry 1907a: 87.

Diagnosis.

Capitulum with five strong, calcified plates; scutal umbones subcentral; apex of carina sometimes slightly overlapping basal end of terga, progressively becoming broader towards base; peduncle very short.

Type species.

Megalasma striatum Hoek, 1883: 51, pl. II, figs 5-9, pl. VII, figs 8, 9.