Unconfirmed British speciesOccurs chiefly in the Mediterranean and Black Sea and on the more southern coasts of Europe to Morocco and the Canaries. Reported in continental literature as occuring in Engalnd but no substantiated British records.
Lives in sand offshore from low water to about 300m.
- Fine straight concentric riblets or striations between and across the ribs
Shell up to 40mm long, 40mm high, 30mm wide, somewhat thin-shelled, roundish oval. In older adults the shell is slightly produced posteriorly but there is no keel. Strongly radially ribbed, 16-18 ribs, wide-spaced, with fine straight concentric riblets or striations between and across the ribs. An intermittent fine ridge along the ribs. Spines stumpy, tuberculate, enrolled. Ribs shown as fluting on the inside of the shell, generaly extending througout. Growth lines
usually distinct. Teeth very similar to those of the preceding species. Juveniles similar to the adult.