Cornwall four of the five mollusc groups are commonly found. Gastropoda
which include the marine equivalent of landed slugs and snails;
Polyplacophora represented solely by the chitons; Bivalvia made
up of two shelled creatures; and the final group Cephalopoda which
incorporates the cuttlefish.
Cornish beaches provide a large range of molluscs, many of which
are rarely found in other parts of the UK. Often it is not the live
animal found but just the shell, this persists long after the body
has decayed or been eaten.