Near the top they are cut by a spiral furrow, so that the upper part of them forms a series of small rounded tubercles just below the suture.

The whole surface is further scored by almost microscopic regular hair-like lines of growth, which are specially sharp whorls, which constricts both the ribs and the interstices.

The whole surface is very delicately fretted with almost microscopic, crisp spiral striae whose course is not quite regular, and which are crimped or disturbed by the lines of growth.

There are about two embryonic whorls on the protoconch, which are small, nearly cylindrical, with scarcely appreciable suture, and end in a blunt, round, laterally flattened-down tip.

The anal sinus is very shallow and round, with no shelf above it; and below it is a very high but little prominent shoulder made by the very slightly advancing lip-edge.