The figure and description of this species are not good. Indeed, without the aid of a specimen identified by Brazier, I should have failed to recognise the species. It seems well, therefore, to introduce here a figure and redescription derived from a specimen dredged off Port Kembla.
Shell elongate, fusiform, thin, angled at the shoulders of each whorl. Colour dull white. Whorls four and a half, plus a two-whorled protoconch. Sculpture : wave-like longitudinal ribs, amounting to thirteen on the last whorl, curve across the sutural shelf, are sharply angled, and project at the shoulder, thence descend perpendicularly to the base, where they disappear. These are overridden by spiral cords, on the upper whorls three, on the last twenty, crowded below and widely spaced above. The meshes of the major sculpture are occupied by microscopical, dense, spiral threads, ornamented by minute gemmules, which give a dusty appearance to the shell. Protoconch exsert, of two whorls, smooth and glossy. Aperture wide, lip simple, straight; sinus broad and shallow, canal abbreviated. Length, 7 mm.; breadth, 3,5 mm.
Off Cape Three Points in 41-50 fathoms; off the Manning River in 22 fathoms; off Port Hacking in 22-38 fathoms; off Botany Bay in 50-52 fathoms; and off Port Kembla in 63-75 fathoms.

This, though exceedingly variable in relative height and width, is a very distinct and easily recognised species. There is very little taper to the spire which contracts rapidly towards the summit, the axial ribs are irregular but are straight, and the whorls are rather flat below the angled periphery. Where the ribs are overridden by the main spiral threads they tend to rise in irregular protuberances, giving a rugged contour to the shell. The specimen figured came from the type locality, 6-9 fathoms, Sow and Pigs Reef, Port Jackson, its length 7 mm., width 2.5 mm., aperture 2.6 mm. Another specimen from the same locality is 8.5 mm. in length, only 2.3 mm. in width and with an aperture 2.8 mm. A series from Eden collected by J. Kitchen, shows the same variation, which is apparently individual and not racial. The species has also been recorded from Victoria.