Shell of moderate size, tapering slowly, glossy, solid. Colour buff, with a chocolate base and sutural band, gemmules white.Whorls about thirteen, parted by distinct sutures. Sculpture;on the earlier adult whorls are two gemmule rows, on the seventh whorl a minute intermediate row is intercalated which gradually attains the size of the other rows, The additional row is nearer to the upper than to the lower row. Along the suture winds a small plain thread, which on the last whorl appears as a fourth row of gemmules. The base has one plain spiral thread. In the immature stage the species has a flat base, The gemmules are set their own breadth apart, about 22 to a whorl, conspicuous against the yellow and brown interstices. Aperture subquadrate, anal sinus simple, spur of lip crossing the callus of the pillar, canal shorter than the aperture. Length 7; breadth 2 mm.

The Sydney shell above described has a general resemblance to T. cinerea, but is more cylindrical, with flatter whorls and a different colour-pattern. The gemmule rows appear narrower and sharper, but this may be an optical illusion, due to contrast of colour. No specimens examined afforded an opportunity for describing the protoconch.
I have identified Sydney specimens by comparison with examples from South Australia, the type-locality, kindly furnished by Dr. J. C. Verco. Our shells are considerably larger and proportionately a little broader, but correspond in all details of sculpture and structure.

South Australia and New South Wales