The commonest species of the genus in Victoria obtained in countless numbers on the whole coastline. In life located in rock-pools or under stones at low tide. It as a wide distribution, occurring in Victoria, New South Wales, Tasmania, through ass Strait to South Australia and Western Australia.

The commonest species of the genus in Victoria obtained in countless numbers on the whole coastline. In life located in rock-pools or under stones at low tide. It as a wide distribution, occurring in Victoria, New South Wales, Tasmania, through ass Strait to South Australia and Western Australia.

Plebian Top Shell. Shell small, depressed, falsely umbilicate; pink, grey, yellow or fawn, spiral ribs with black and white dots sometimes being radially arranged, base lighter colour; apex acute, whorls five, cingulate, sutures subcanaliculate; body whorl roundly angulate at the periphery; three cinguli on the penultimate whorl; four weakly beaded cinguli on the body whorl, the first two contiguous, the third separated by wide intervals, the fourth peripheral of two ridges close together; interstices with fine spiral and accremental striae; base convex, six to nine smooth spiral striae; with interstitial microscopic spiral striae; columella oblique, concave, inserted upon the side of the fake umbilicus; columella margin scarcely reflexed, with a basal denticle, false umbilicus white with a denticulate margin. Diameters 10 mm. and 9 mm., height 7 mm.

As Trochus takapunaensis, Webster, 1906.
Shell small, depressed conoidal, spirally cingulate. Sculpture: Smooth rounded spirals, of which the 2 upper are closer together and the others far enough apart to admit a fine spiral thread in the radially striated hollow between them ; above the peripheral spiral on the body-whorl is a narrower one, which appeared in the suture of the third whorl; base with 7 to 8 spirals, separated by furrows of the same width. Colour yellow-grey, with very dark irregular patches, all of which shade into white from left to right. Spire depressed conoidal, sides convex. Protoconch rounded, smooth, of 1| whorls. Whorls 5, slightly rounded, the last carinated at the periphery; base convex. Suture canaliculate. Aperture rhomboidal, oblique. Peristome with numerous irregular denticles, some of them extending far into the shell. Columella oblique, arcuated, having a blunt tubercle on the funnel side, and a long fold transversely wound over the anterior end and passing into the shell. False umbilicus deep, funnel-shaped, contracted at the margin by a spiral rib with occasional tubercles.
Diameter, 7,5 mm. ; height, 5 mm.
Type in Mr. W. H. Webster's collection.
Hdb —Takapuna, in shell-sand.
Remark.—The shell has a close resemblance to the Victorian C. plebejus. (Hedley.)