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(Pennant, 1777)

Description (shell):
Shell convolute, elongate-oval, drawn out into apical and basal canals; thin, polished; juvenile shells (<5 mm long), with short spire. Fine sculpture of low strap-like spiral striae; appears smooth to naked eye. Aperture curved, wider below parietal bulge of last whorl; apical canal short, basal canal wide, bordered on left by ridged columella.

Size:
Up to 22 x 12 mm.

Colour:
White or yellowish.

Animal:
Snout short, no proboscis; mantle drawn out anteriorly into a siphon, which projects from basal canal; lateral extensions cover most or all of shell in active animals. Foot large, elongate, with posterior pedal gland on sole and double-edged anterior end; no operculum.

Habitat:
Sublittoral, associated with coelenterates (Eunicella , Alcyonium and Tubularia ) on hard substrata from 15-75 m.

Distribution:
Distributed from Spain to west Channel; not common (Distr. S. patula).

Simnia patula