height of the aperture; outlines straight. Protoconch minute, heterostrophe, globular. Whorls 5, regularly increasing, flatly convex, the last not angled; base flattish. Suture impressed. Aperture slightly oblique, angled above and narrowly produced below. Outer lip regularly rounded, thin and sharp. Columella subvertical, almost straight, with a minute plait above; inner lip extending a short distance beyond the pillar, and as a thin layer over the parietal wall.

Diameter, 1.5 mm.; height, 3.3 mm.

Type in my collection.

Hab.—Port Pegasus, Stewart Island, in 18 fathoms (Captain Bollons).

Remarks.—This species is nearest allied to O. impolita, Hutt., but it is smaller, more slender, and the spiral sculpture is much more distinct. The fossil O. fasciata, Hutt., is also very similar, but has a differently arranged sculpture and an open umbilicus. Hutton's name, dating of 1885, being preoccupied by Dunker, 1860, I propose the name O. huttoni for it.