(Sowerby, 1813)
Description (shell):
In general like other Emarginula species. Finely reticulate, seems rather smooth. With about 50 radiating costae.
Size:
Up to 30 x 20 x 15 mm.
Colour:
White.
Animal:
Foot with about 30 epipodial tentacles.
Habitat:
Under stones, rarely at LWST, more frequent sublittorally to 200 m.
Distribution:
Northern species which is limited in Britain to west Scotland, Orkney and Shetland (Distr. E. crassa). Also recorded from south-west Ireland and Antrim. Commoner in Norway and Iceland.