flat near the suture, rounded at the periphery; base convex. Suture not much impressed. Aperture circular, peristome continuous, solid. Umbilicus wide and perspective.

Altitude, 1.5 mm.; diameter—maj., 2.5 mm.; min., 2 mm.

Type to be presented to the Colonial Museum.

One specimen only was gathered. I fully agree with my friend Mr. Hedley that this species is nearly allied to C. tatei, Angas, from South Australia, but the latter is larger, has a more elevated spire, the spiral ridges are less numerous, more distant on the upper side, and the interstices are ornamented with close fine and oblique radiate striÆ, a feature totally wanting in our species; there are only faint incremental lines. I found this shell also in sand from Lyall Bay.