Shell minute, subulate, smooth, narrowly perforate. Sculpture ; The longitudinals consist of minute growth-striae, with a few growth-periods, subcostate in places. Colour porcellanous-white. Spire high, slender, and tapering. Protoconch consists of about 2 smooth rounded whorls, the second slightly swollen, the nucleus oblique. Whorls 7, slightly rounded ; the antepenultimate whorl is indistinctly feebly bicarinate ; this is better defined upon the next whorl, especially the superior angle which forms the subtabular sutural shelf ; upon the last 4 or 5 feeble carinae, 3 of which are above the aperture ; base rounded. Suture deep. Aperture vertical, subtriangular. Outer lip sharp, regularly curved, effuse, and angled at the junction with the basal extension of the columella, producing a small spout-like canal. Inner lip forming a narrow thin callosity on the pillar, which is subvertical and slightly sinuated ; a thin callus extends above over the body to the outer lip. Umbilicus very narrow, open. Operculum unknown.
Diameter, 1,04 mm. ; height, 2,9 mm.
Type in the Dominion Museum, Wellington.
Hab.—Of! Great Barrier Island, in 110 fathoms.
A single empty shell was obtained.