The Conchological Society of Great Britain and Ireland

Solid shell up to about 4cm in length. Pale yellow, dirty white or brown in colour sometimes with lines zig-zags or blotches of purple or brown. Sculpture of flattened concentric rings crossed by very fine radiating lines (difficult to see with the naked eye). Pallial sinus reaching the midpoint of the shell. Inside of shell white or cream tinged with yellow. Lunule bounded by a fine groove. Each valve has three cardinal teeth; the centre tooth on the left valve and centre and posterior on the right valve are bifid.