Shell large for the genus, composed of eight very angular whorls, which form a sharp pointed, regularly tapered, turreted spin1. Nucleus very small, regularly coiled, consisting of two and a half shining, light yellow whorls in striking contrast to the dull, rough surface peculiar to the rest of the shell. The first one and a half turns are perfectly smooth, while the last one is crossed by minute, transverse rihlets. Suture marked by a conspicuous, rounded, undulating cingulus or thread on the preceding whorl. The sculpture consists of prominent, straight, angular, alternating ribs (nine on the body-whorl), forming a conspicuous node at the angle, extending from suture to suture. These, with their deeply concave interspaces, are crossed by unequal, conspicuous, well-rounded, granulated cinguli and microscopic threads. The first cingulus, defining the shoulder of the whorls, is double with the upper half slightly the larger, the sutural one is the next in size, while between these there are two still finer ones; these are unequally distant from each other, the first and second being much closer together than the others, and the intervening surfaces are covered by unequal, microscopic threads. Above the angle of the whorls the threads alone occur and number about nine. This ine¬quality in the spiral sculpture makes the edges of the transverse ribs very rough and jagged. On the body-whorl there are about thirteen cinguli below the shoulder, unequal in size and unequally separated, those on the canal larger and closer together than those just above it, while the fourth one below the angle is so prominent as to make a slight angle in the outline of the whorl. Below this angle the transverse ribs curve in toward the columella following the outline of the outer lip, and extend to the end of the canal, the curvature being most noticeable in a dorsal view. Very fine striae intersect the cinguli and the threads in the direction of the lines of growth, rendering them granular and give the appearance to the shell, when dry, of being covered with a fine, gray dust. Aperture long, narrow-ovate, with a moderately long, rather narrow canal. Outer lip not thickened, with a comparatively thin edge and a broad, moderately deep sinus extending from the suture to the angle. Columella slightly curved ; inner lip marked by a narrow stripe of conspicuous red enamel. Color light yellow-brown ; interior of aperture of the same couspicuous red color as the inner lip. In young specimens this coloring is wanting.
Length, nearly 8mm ; breadth, 8mm; length of aperture, 3*5mm; its breadth, lmm.

USA. North Carolina. Cape Hateras.