Shell thin, semitransparent, composed of 3 larval whorls (the embryonic shell is missing) and \ 1,5 very convex postlarval whorls, with a deep suture. There is no subsutural zone. The adult sculpture consists of evenly spaced shallow grooves. The axial sculpture consists only of growth lines, occasionally a little stronger. The larval shell is c. 2 mm high and sculptured with bent axial ribs and numerous very fine spiral lines. The adult outer lip is a little broken but it has evidently been evenly convex. The siphonal canal is short, broad, curved towards the columella. The columella and body whorl form a regular curve where they meet. The colour is light yellowish white; the larval shell has about the same colour. Dimensions: height of the shell 6.6 mm, breadth 4.0 mm; height of the aperture 3.9 mm, breadth 2.0 mm.
Remarks. The unusually big size of the larval shell, which is evidence of planktotrophic larval development, and the very convex postlarval whorls are the best identification characters.