Shell short, stout, with a smooth rounded whitish inflated nucleus of two whorls and eight subsequent whorls; color whitish or pale madder brown; spiral sculpture of obsolete spiral striae, generally a little wavy, and often absent from a part or the whole of the shell; they are strongest on the base, but are generally so faint as not to interrupt the apparent smoothness of the surface nor to be perceptible without a lens ; suture appressed, undulated over the ribs; fasciole narrow, excavated, smooth except for lines of growth and the undulations due to the ribbing; transverse sculpture of rather faint growth lines and of (on the last whorl 12) strong, stout rounded ribs, strongest in front of the fasciole where they end bluntly, extending across the whorl and disappearing only on the canal; the interspaces are about equal to the ribs, which are slightly obliquely set; varix large, stout, simple; outer lip in front of it thin, arched, not internally lirate; aperture rather narrow; notch subcircular ; inner lip and pillar with an elevated rather thick callus ; pillar concave ; canal short, distinct, deep, curved to the right in the adult; siphonal fasciole distinct. Max. lon. of shell, 15.5 mm; of last whorl, 8.75 mm; of aperture, 5.5 mm; max. lat. of shell, 6.2 mm.

This strongly marked little species may be readily distinguished from C. ebur Reeve, found with it, and of somewhat similar appearance, by the absence of the spiral threads, the more prominent whorls, the stouter ribs, and the more deeply excavated suture.

USA. North Carolina. Off Cape Hatteras.