Ovoid with flatter apertural/ventral face. Some vernacular names liken it to coffee bean (Dutch, French) or kernel of oats (Scots).
L: left side profile. R: right side profile.
1: approximate position of enveloped spire at posterior of animal.
2: ventral/apertural face white.
3: pinkish shell-material deposited in grooves on dorsum.
4: no lip on body-whorl on left of aperture.
5: thickened white labial varix on right side near outer lip.

Height (longest shell-dimension) 11.2 mm. Ardnamurchan, Scotland. April 1976.