Shell thin, slender, fusiform, spire keeled and turreted, base contracted. Whorls seven, including a whorl and a half of protoconch, parted by linear rather oblique impressed sutures. Colour varying from pearl grey to pale orange, usually cheese colour. Sculpture : the protoconch is glassy with rounded whorls, the adult smooth and somewhat glossy though duller than the protoconch. The periphery is sharply produced into a projecting keel, the fasciole set with pointed radiating tubercles, of which the penultimate whorl bears eighteen, these tubercles continue upwards, diminishing proportionately to the protoconch, but downwards they degenerate on the last whorl to imbricating scales. The unarmed keel slightly rises at its termination, bringing the shelf above it nearer to the horizontal. The fasciole ends in a deep and narrow slit, Canal open, produced, bent a little to the right. Under the lens, delicate growth lines appear which diverge acutely above and below the keel, crossing the base they are flexed. Aperture narrowly pyriform, a callus spread on the inner lip. Length 13 mm. : breadth 5 mm.