Shell small, thin, semi-transparent, white, depressed, auriform, carinated. Whorls 2¼, very rapidly increasing, including a low convex smooth protoconch of one whorl. Spire about one-third height of aperture. Upper surface broadly rounded, periphery bluntly keeled, base concave. Umbilicus widely open, perspective. Aperture wide, almost half the area of the base. Outer lip thin; inner lip continuous, bridging parietal wall. The only sculpture is in the form of close, regular, weak radial growth striae strongest within the basal concavity.

Height, 1·1 mm.; diameter, 2·3 mm. (holotype).
Holotype in writer's collection, Auckland Museum.
Localities: Tom Bowling Bay in shell-sand (holotype); Station 931, “Discovery II” Expd., 95 metres, between Spirits Bay and Three Kings Islands (1 damaged shell).

This adds a genus to the New Zealand fauna, the nearest related species being N. kimberi Verco, 1907, from Gulf St. Vincent, South Australia.