The protoconch is persistent, set obliquely, exposing part of two spiral whorls.

The sculpture shows fine incremental threads, scarcely undulated by obsolete radial ribs.

The slit on the summit is linear-lanceolate, more than three times longer than broad.

The septum is drawn down to a third of the length of the shell, completely screening the interior from the slit, thickened at the margin.

The comparative smoothness, persistent apex, narrow fissure and long septum, sufficiently characterise this minute species, which is the first of the genus to be recorded from New Zealand.