The shell is small, long and slender, pale buff, clouded with dull brown. First 2,5 whorls smooth, convex, the remainder with rather sharp axial ribs separated by wide, concave intervals, about 16 ribs on the last whorl, where they do not extend upon the base. Surface glossy. There are 10 convex whorls, several intermediate ones more convex than those above and below. The suture descends a little to the aperture, and there is a low swelling behind the outer lip. Aperture small, the outer lip brown-edged, with about 8 or 9 delicate lirae within. Siphonal sinus ample, deep. Siphonal fasciole somewhat convex, without a bounding ridge. Parietal and columellar callus very thin. Axis pervious.
Length 7.4 mm., diam. 2 mm.

This little shell has delicate lirae within the outer lip, but in other respects it has much the appearance of Mazatlania. It seems nearest to the unfigured "Truncaria" eurytoides Cpr., which we have not seen, but differs in being narrower, with fewer ribs and more whorls.