The size of the shell varies between 5 mm and 21 mm. The solid, umbilicate shell has a globose-conic shape. Its color is black, brown, or grayish-pink, either unicolored or tessellated with dark spots. The conic
spire is short. The
sutures are deeply canaliculate. The 5-6 convex
whorls are encircled by numerous equal, densely, finely beaded spiral ribs, with deep interstices, in each of which an interstitial riblet arises on the last part of the
body whorl. The spiral ribs on the penultimate whorl number 7 to 9. On the body whorl they number 12, exclusive of the interstitial riblets. The convex body whorl is rounded, quite abruptly and decidedly descending at the
aperture. The rounded aperture is strongly, finely sulcate inside. The
columella is straight, with a small projecting tooth at base. The
umbilicus is deep, bounded by a strong white rib, about 1 mm. diameter. Larger specimens (16–23 mm. alt.) are paler, and have a small riblet developed in each interstice, thus about doubling the number of spirals. ==Distribution==