(Müller, 1776)
Description (shell):
Shell small, conical, apex central or slightly anterior, often eroded to reveal nacreous layer below. Sculpture of fine reticulation; radial ridges may be papillate, especially towards shell margins. No internal apical septum, anterior limit of horseshoe-shaped muscle scar half-way between apex and anterior margin.
Size:
Up to 17 x 13 x 7 mm (commonly half this size).
Colour:
White, opaque.
Animal:
Colour whitish. Body patelliform, though lacking pallial gills and tentacles; cephalic tentacles without pigmented eyes. Foot tapering posteriorly; mantle edge simple; mouth transversely elongated.
Habitat:
Sublittoral on hard substrata, gravels and clay.
Distribution:
Circumpolar distribution, extending south at increasing depths to the Azores (Distr. L. caeca).