Solid shell up to about 5cm long. Dirty white to pale fawn in colour, sometimes with red brown rays. Pallial sinus small and triangular. Sculpture of concentric ribs which are sometimes broad and flattened and others sharp and foliaceous. Periostracum, if present, is chestnut brown and strongest at the edge of the shell.
- Inner margin of shell crenulate
- Prominent concentric ridges on shell surface
- The anterior and posterior margins on the outside of shell do not possess wart like spines.
Shallow burrower in bottoms of sand, muddy sand, gravel and shell gravel. Feeds by filtering phytoplankton from the water.
Found from the south of Norway to the Iberian Peninsula and into the Mediterranean.