Shell planorboid, sinistral, very small, bluish white, semitranslucent. Early whorls completely covered by the succeeding turns on the upper surface, where the last turn only is visible. This is marked by strong lamellar ribs which are decidedly sinuous and have a retractive slant. These ribs become attenuated toward the summit to which they do not quite extend. They are about one-third as broad as the spaces that separate them. These spaces are marked near the periphery by a few, feebly expressed, fine, spiral lirations. Base sculpture similar to tho upper surface except that only a very small portion of the smooth nuclear whorl is apparent. The ribs here decrease suddenly in size as they approach the inferior suture, and vanish just before reaching it. Aperture oblique, subcircular; outer lip thin, showing the external sculpture within; inner lip decidedly curved and somewhat reflected; parietal wall covered with a thick callus.
The type, Cat. No. 250519, U.S.N.M., comes from Port Alfred (Coll. No. 1802). It shows a little more than the last whorl, and measures: Altitude, 0.8 mm.; greater diameter, 1.8 mm.
Cat. No. 25051S contains another specimen from the same locality (Coll. No. 1391).