The large head has the eyes sessile on the sides below the base of the tentacles. The tentacles are far apart, united by a broad veil over the head. The mantle is sometimes greatly developed, covering the sides of the shell. The siphon is recurved, short, with auricles on each side of the base. The foot is very large, partly hiding the shell. There is no operculum. The shell shows distinct plaits on the
columella. The
apex of the
spire is mamillated. The shells have an elongated
aperture in their first
whorl and an inner
lip characterised by a number of deep
plaits. The family of Volutidae comprises a suite of large shells remarkable for their great beauty and elegance of form. The shell of species such as
Melo amphora can grow as large as 50 cm (19.7 inches) in length. Volutes are distinguished by their distinctively marked spiral shells (to which the family name refers,
voluta meaning "scroll" in
Latin). The elaborate decorations of the shells has made them a popular collector's item, with the imperial volute (
Voluta imperialis) of the
Philippines being particularly prized. == Taxonomy ==