Asperdaphne sepulta: Shell of medium size, spire elongate, white. Protoconch with a small oblique nucleus, the next whorl inflated and microscopically spirate, the next whorl with two prominent spiral keels. Mature whorls six, rounded, with a shelf above the periphery, the base excavate, sutures deeply impressed. Sculpture of a few wide rounded weak axial ribs, ten to the whorl, ceasing at the periphery and at the base. Spiral sculpture strong, of close cords, alternating in size, overriding the axial ribs, but not rising into tubercles as in A. rugosa, the base and columella with spiral cords only. Aperture short, outer margin rounded, thin, the sinus deep and on the suture. Columella short, medially twisted, a narrow callus within the aperture, canal deep, narrow and slightly twisted. Length 12.5 mm., width 5 mm., aperture 4.5 mm.

Asperdaphne sepulta: Australia. New South Wales.

Asperdaphne sepulta: The type came from the original dredgings by the "Triton" in the East Channel, in which the excavation was very deep and where specimens from as much as 40 feet below the harbour bed were bleached to a uniform cream or yellow colour. These included many strange molluscs, some of which are apparently extinct and may go back as far as the Pleistocene in age. A. sepulta may be one of these. It resembles A. rugosa, but has a more rounded aperture, the axial ribs are fewer and weaker and the spirals are more closely packed and do not rise in tubercles above the ribs.