Typically, each animal of this subclass secretes a tubular whorl that forms an ever-enlarging cone-shaped shell as the snail grows. Normally, the snail's soft body is completely hidden within the shell. Occasionally, a tube-like mouth and two tentacles are seen extending from the shell's opening. Eyes are usually located at the base of these tentacles. A short leathery foot is extended to slowly drag the snail about. Many species have a hard disc attached to the foot. This covers the opening of the shell when the animal withdraws. A few species extend their mantle over the entire shell as camouflage.
Scientific synonyms and common names
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