Animal having the eye-bearing peduncles long and the tentacles ciliiform ; there are 3 pairs of epipodial cirri ; the foot is short, obtuse behind. Formula of teeth of radula oo 5 + 1 + 5 oo. The central tooth has a body with broadly expanded supporting-wings, a narrowed neck, which bears a simple cusp ; this peduncle has on each side delicate wings, identical with those found in several species of Gibbula. The lateral teeth, 5 on each side, increase in size from the inner to the outer one ; this peculiarity, together with that of the central tooth, will enable one to recognise a radula of this genus at a glance. The inner lateral is slender, narrowed toward the cusp, like the centrals, and sometimes bearing a lamella behind the peduncle. The outer laterals are very broad, with one or several denticles on the cusp. There are no jaws.
Shell ovate-conic or pyramidal, imperforate, smooth or spirally sculptured outside, brillantly iridescent within; colours generally bright and variegated ; aperture less than half the length of the shell, longer than wide, ovate; columella usually more or less folded or toothed near the base.
Distribution.—Australasian seas. Fossil in the Pliocene.
This genus is also Indo-Australian, like Trochus.