Shell small, rather solid, fusiform with highly convex whorls, white. Whorls 6, including a protoconch of 2 rounded whorls sculptured with numerous microscopic spirals. Whorl outlines highly convex, sutures impressed, base deeply excavated. Canal moderately long, straight. Sculpture of broad raised axial folds, crossed by broad, raised spiral cords. Some 14 axials on the penultimate, 17 on the body whorl. Three spirals on the spire whorls, five on the penultimate, some 21 on body whorl, base, and neck (14 on the body whorl and base, 7 on the neck), somewhat variable in strength. The axials run from the shoulder to the lower suture on the spire whorls, but do not reach the base on the body whorl. Aperture wide, pyriform. Outer lip thin, sweeping broadly forward from the sinus. Canal short, open, and straight. Sinus sutural, of moderate depth. Colour white, protoconch purplish-brown in some specimens, in others polished white. Height. 6,0 mm. ; diameter, 2,9 mm.

This species is closer to some Australian species, such as A. compacta Medley from 80 fathoms off Narrabeen, than it is to either of the New Zealand forms previously classed in this genus. A. ula (Watson) and A. aculeata (Webster). From compacta Hedley it may most easily be distinguished by the fewer spirals on the spire whorls.