Shell imperforate, trochiform, solid ; spire conic ; apex mamillar, obtuse. Whorls 5, separated by an impressed suture, inflated on their inner side, but on the outer compressed at the very sharp keel, which runs around the whorls and disappears just behind the aperture. Sculpture coarse, oblique growth lines decussated and somewhat microscopically beaded by minute, close, waved, spiral, impressed lines. Colour above pale purple, which fades into white on reaching the keel of the last whorl ; the latter is above the periphery painted by seven chestnut spiral bands, opaque when seen by transmitted light; behind the aperture these bands broaden and merge together into a dark transverse stain ; thinning out they fade away after ascending the shell for about half a whorl. The base is encircled by five similar bands. Aperture diagonal, abruptly and deeply descending. Lip intense black, broadly reflected, beaked at the periphery, above the beak dinted without and tuberculate within. Columella very broad, adherent to the base, toothed on the inner edge. Margins united by a narrow brown ridge of callus Fragments of a coarse (?) yellowish, hydropkanous epidermis appear on the last whorl.
Maj. diam. 40, min. 33, alt. 22 mm.
One example containing the animal was found, March, 1894, at a height of from 1000 to 6000 ft. on Mount Maneao, B.N.G., by the collectors of Sir William Macgregor.
Type in the Australian Museum.