Shell thin, smooth usually brownish edged in green. Attached to
hard surfaces: jetty pilings, boulders. Common on our Northern shores,
sometimes in huge numbers.
Shell flat, circular and ribbed. Long and short tentacles emerge from gape.
Seagrasses and reefs. Sometimes seen on our Southern shores.
Shell thin, translucent, white. Lies unattached on the ground. Seagrass
areas. Commonly seen on our Northern shores and some southern shores.
Shell flat, thin, round, white. Stuck to mangrove tree roots often
in large groups. Commonly seen in our mangroves.
Shell thin and fragile, margin rounded, with weak ribs and small scales,
purplish brown. Seagrass areas. Common on some of our shores.