Shell thick, pale with a net-like pattern of dark thick lines. Under
stones. Sometimes seen on some of our Southern shores.
Shell thick, black with white or yellow zig-zag stripes. Red or
orange ones sometimes seen. On and under stones. Commonly seen in
small groups on many of our Southern shores.
Shell round with fine ridges, mother of pearl at shell opening. Sometimes
seen under stones on some of our shores.
Shell thick, coiled to form overall conical shape.
Operculum conical, resembling a drill. On rocks and rubble.
Seldom seen on our shores.