Shell narrow, elongate, tapering in a slender spire and blunt anteriorly. Colour white, irregularly longitudinally splashed with chestnut. Whorls seven, the upper angled, the last straight. Sculpture— round the angle of the upper whorls runs a line of tubercles, of which eleven occur on the penultimate. Very slight longitudinal undulations, hardly to be called ribs, extend from these tubercles across the whorl; both vanish before attaining the last whorl. This latter is girt with about twenty, sharp, revolving ridges, of which the-central is largest and corresponds to the tuberculated angle of the earlier whorls; the rest vary in size and spacing, the basal ridges being least and closest; the upper seven ascend the spire. A large varix is behind the aperture, and a page 434weaker one half a whorl back, none else appear. Aperture perpendicular, oval. Outer lip smooth within, sharp edged, crenulate outside, inner lip excavate, thickly lined with callus, with a posterior nodule at the margin of the channelled angle. Length 7, breadth 3 mm.