Fragile shell up to 4cm in length. Dirty white or brown in colour on the outside. The inisde is dark green and glossy. The surface is sculptured with fine concentric and radiating lines.
- Two muscle scars on the upper valve are joined.
- The muscle scars are furrowed
Lives on bottoms of coarse sand and gravel attached to rocks or other shells.
Distributed from Norway south to the Mediterranean.