Spire conical with flat to slightly concave sides. Apex oblique or not. Whorls 5-5 3/4, convex; last whorl rounded. Constriction with a transverse palatalis, sometimes an inconspicuous columellaris. Tuba free from the spire, rarely close to it again near the apex, gradually to abruptly narrowed towards the constriction, rounded below. Radial ribs on the spire moderately spaced (4 ribs/0.5 mm on the penultimate whorl), (slightly) sinuous; but those close to the tuba rather closely placed to moderately spaced (4-8 ribs/0.5 mm), not or hardly sinuous; those on the tuba closely placed to moderately spaced (6-11 ribs/0.5 mm half-way), not sinuous below. Spiral striation absent. Umbilicus open, 0.30-0.40 mm across. Aperture tilted up to 30° with regard to the coiling axis, its upper margin slightly below the level of the apex to widely above it, circular to elliptic. Peristome distant from the spire, double; outer peristome only slightly spreading beyond the inner, but gradually narrowed towards, and absent along the right or lower side of the aperture; inner peristome slightly protruding from the outer, moderately spreading. Spire: height 1.4-1.7 mm; width 0.9-1.0 mm; index 1.4-1.7. Total width 1.5-1.6 mm. Height aperture 0.5-0.6 mm; width 0.5 mm. Distribution. — Borneo: Sarawak, 4th Div., Tatau Valley.