Wentletrap, the popular name of the gasteropod shells of the genus scalaria (Lam.), from scala, a stair. The shell is long and turreted, with many whorls, close or separated, ornamented with numerous transverse prominent ribs; the mouth is circular and the lip continuous, closed with a horny operculum; the tube of the shell is perfect; the teeth are in numerous longitudinal series. More than 100 species are described, in nearly all the seas of the world, though most beautiful in the tropics, ranging from low-water mark to 80 fathoms; most of them are pure shining white, and they emit a purplish fluid when disturbed. The commonest species on the coast of New England is the S. Gramlandica (Gould), about an inch long and a third of an inch in its greatest width; it is livid brown or bluish white, with ten close, moderately convex whorls, and white flattened ribs; it is abundant on the Grand Banks. There are several species on the coast of Europe, and many in the Indian ocean; one of the handsomest is the S. pretiosa (Lam.), of the China seas, 1½ to 2 in. long, snow-white or pale flesh-colored, with eight separated whorls.