n.
Any of various species of snails that have a flattened shell.
Most marine species (subclass Prosobranchia) cling to rocks near shore. A common U.S. species is the Atlantic plate limpet ( Acmaea testudinalis ) of cold waters. Keyhole limpets have a slit or hole at the apex of the shell. Some limpets (subclass Pulmonata) live in brackish water and freshwater. See also mollusk .
European limpets ( Patella vulgata ) with acorn barnacles ( Balanus balanoides )
Neville Fox-Davies
Bruce Coleman Inc./EB Inc.