Shell rather large, thin, regularly turbinate, base flattened, periphery subangled, spire elevated. Whorls seven, gradually increasing, regularly rounded except a narrow flat step below the suture. Colour beneath white, above pale cinnamon with darker radial streaks on the last whorl. Entire surface glossy, as if well oiled. Sculpture : closely scored by sharp spiral cuts, which are deepest about the periphery, fainter midway up the whorl and vanish from the base and from the first four whorls. On the penultimate whorl between the insertion of the lip and the suture, there are sixteen of these impressed spirals. The flat interspaces are obliquely crossed by faint irregular growth lines. Aperture very oblique ovate, upper insertion parried far forward, connected with the lower by a thin dull film of callus. Lip quite sharp, within a white edge is followed by a brown border and that again bv a nacreous layer. This sequence again appears along the interior suture. Umbilicus a broad open funnel, penetrating to the initial whorl, margined by a beaded funicle which ends in an expansion on the columella base. The interior of the umbilicus is spirally scored like the periphery, and is undercut at the junction of each whorl. Height 12 mm.; major diameter 16 mm. ; minor diameter 13 mm.
A single perfect specimen from two hundred and fifty fathoms, twenty-three miles east of Sydney.

Shining Top Shell. Shell rather large, thin, regularly turbinate, base flattened, periphery subangled, spire elevated; colour beneath white, above pale cinnamon with darker radial streaks on the last whorl; whorls seven, gradually increasing, regularly rounded except for a narrow flat step below the suture; entire surface glossy, as if well oiled; sculpture of closely scored spiral cuts which are deepest about the periphery, fainter midway up the whorl and vanish from the base and from the first four whorls; on the penultimate whorl between the insertion of the lip and the suture, there are 16 of these impressed spirals; the flat interspaces are obliquely crossed by faint irregular growth lines; aperture very oblique ovate, upper insertion carried far forward, connected with the lower by a thin dull film of callus; lip quite sharp, within a white edge is followed by a brown border and that again by a nacreous layer; this sequence again appears along the suture; umbilicus broad open funnel, penetrating to the initial whorl, margined by a beaded funicle which ends in an expansion on the columella base; interior of umbilicus spirally scored like the periphery and undercut at the junction of each whorl. Diameter 16 mm., height 12 mm.

South Australia, Victoria, New South Wales.