The whorls are covered with oblique small folds, so interrupted as to appear more or less in spiral series.

The base of the shell is flat, white a yellowish, unicolored, all over concentrically lirate.

The lirae are smooth, narrow, separated by shallow grooves as wide or wider than the ridges, and continuous within the aperture upon the parietal wall.

The basal margin is straight, bearing, within, a strong acute revolving lamella, opposite to a similar but smaller one upon the parietal wall.

The above description applies to the typical form of this species, the prominent characters of which are the smooth, subequal basal lirae, closely wrinkled upper surface, with projecting peripheral tubercles, and strongly uni-lamellar basal and parietal walls of the aperture.