Smith (1892)'s description
"Testa dextrorsa, conica, rimata, rufescens vel alba; anfractus 5-5 1/2, convexi, primi duo laeves, caeteri lamellis obliquis tenuissimis in medio spiniformibus instructi, ultimus antice longe solutus, versus aperturam retrorsum et sursum contortus, seriebus duobus spinarum ornatus; spinae semitubuliformes, curvatae; series inferior longior, cristam basalum formans; apertura circularis rufescens vel alba; peristoma tenue, undique late expansum et concentrice striatum. Alt. 3 millim., diam. maj. 3 2/3 min., min. 2. Apertura cum perist. 1 1/2 lata."
Vermeulen (1994)'s description
"Spire conical with about flat sides. Apex not oblique. Whorls 4 7/8 - 5 3/8, convex; last whorl rounded. Constriction with an inconspicuous parietalis, a transverse palatalis. Tuba gradually narrowed towards the constriction, slightly angular below. Radial ribs on the spire widely spaced (2-3 ribs / 0.5 mm on the penultimate whorl), with a (deeply) trough-shaped projection half-way the whorls, abrading to a (deeply) looped scar, but those on the last whorl with a double-channeled projection (the lower channel deeper than the upper) abrading to a scar with two adjacent loops when the shell is observed in front view; those on the tuba widely spaced (1-2 ribs/0.5 mm half-way), below with a long, deeply trough-shaped to almost tubular, almost straight to distinctly curved projection abrading to a deeply looped scar. Spiral striarion present. Umbilicus open, 0.25-0.30 mm across. Aperture tilted 30-45 degrees with regard to the coiling axis, its upper margin slightly below the level of the apex, sometimes slightly above it, circular. Peristome distant from spire, double; outer peristome moderately to widely spreading beyond the inner all around, but gradually narrowed towards the right side of the aperture and soemtimes (almost) absent there; inner peristome slightly to moderately protruding from the outer, (widely) spreading. Spire: height 1.8-2.2 mm; width 1.3-1.5 mm; index 1.3-1.5. Total width 2.6-3.1 mm. height aperture 0.7-0.8 mm; width 0.7-0.9 mm."