Formerly known as the Family Lamellariidae, these are
slug-like snails with thin abalone-like shells without holes. The animal's mantle completely and
permanently covers the shell and a round siphonal tube and simple
tentacles readily distinguish it from other sea
slugs. The mantle is colored to resemble its colonial
prey. Rarely found due to their small size
and cryptic habit. Precise identification is impractical without
killing the animal and examining the shell.