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 striation present. Umbilicus open, 0.25-0.30 mm across. Aperture tilted 30-45° with regard to the coiling axis, its upper margin slightly below the level of the apex, sometimes slightly above it, circular. Peristome distant from the spire, double; outer peristome moderately to widely spreading beyond the inner all around, but gradually narrowed towards the right side of the aperture and sometimes (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.
Distribution. — Borneo: Sarawak, 1st Div., limestone ranges around Bau.