Shell waxen white, acute, with nine or ten rather inflated whorls; nucleus inflated, globose, sinistral, polished, mostly immersed; remaining whorls sculptured with (on the last whorl) about twenty-five close-set rounded ribs, extending from suture to suture, and but little curved; also a few faint lines of growth; no spiral sculpture; base smooth, except for a few lines of growth; general surface polished; aperture subquadrate; pillar slender with a faint spiral ridge; suture very distinct. Lon. of shell, 8.3; of last whorl, 2.9; max. lat. of shell, 2.75 mm.

This shell may not be perfectly mature, but in any case is unusually short for its breadth. The figure appears slightly less acute than the shell itself, and the anterior prolongation of the aperture is due to a fracture. It differs from all the species figured by Orbigny, Jeffreys, Watson, and Verrill, and I cannot identify it with any of the unfigured species of this puzzling group.
The ridge or plica on the pillar is undoubtedly variable among individuals in some, if not all, of the species of this group. When apparently absent near the mouth it can usually be found on the pillar of the more apical whorls.

Yucatan Strait, 640 fms. Off Hatteras, in 15-124 fms., sand, temperature 61° F.;