Up to 35mm long, 40mm high, 35mm across, plump, roundish. Juveniles longer than high. 32-38 ridged close-set radial ribs, sometimes obscure towards the posterior, crossed by concentric striations and growth lines. Periostracum grey and thick. Teeth small, sharp. Margin crenulated, with fluting on the inside extending about 1/5 of the way into the shell. Greyish yellow with narrow concentric bands of darker colour. Inside off-white.
Lives in sand or muddy gravel, 10-100m.