Fragile shell up to 1cm in length. Shell white but often obscured by a rust coloured deposit. Inside may have a light purple tinge. The surface of the shell is sculptured with concentric lines and a few faint radiating lines.
- Surface sculptured with concentric lines but not ridged
- No posterior latteral tooth
- Rust coloured deposit on shell surface
Lives commensal with the sea urchin Echinocardium cordatum particularly in muddy sand.
FrequentDistributed from the north of Norway south to the Mediterranean