A. villosa.
A. dentata.
A. striata.
A. vitrea.
A. lævis. The smooth Anatifera. Pl. [4], fig. 5.
Five smooth valves; the dorsal one rounded at the sides, and slightly carinated; peduncle long, naked, of a scarlet colour.
8. Pollicipes. Three species.
Easily distinguished by the numerous small valves situated at the base.
Pollicipes cornucopia.
P. mitella.