Definition of "littorina" []

• A genus of small pectinibranch mollusks, having thick spiral shells, abundant between tides on nearly all rocky seacoasts. They feed on seaweeds. The common periwinkle is a well-known example. See periwinkle. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "I sent them in search of the shell, and they returned bringing me some living specimens of different shells, chiefly _littorina_ and _cerithium."