Shell slender egg-shaped, rather small. Colour white. Embryonic whorls intorted, of type B. Teleoconch of three and a half to four, moderately convex whorls; the last whorl measures more than half the total height of the shell. Suture clearly defined. Growthlines slightly prosocline, with a tendency to become orthocline on the lower whorls; no further sculpture. Outer lip thin, smooth inside. Only a slight umbilical chink. Tooth small but conspicuous.
Dimensions: H. 1.4-1.8 mm, W. 0.7-0.9; holotype: 1.4 x 0.8 mm.

This species looks like a slender miniature of O. angusta Jeffreys, 1867, but with the same number of whorls it measures about half the size of that species.
Depth range: 0-142 m.