Shell of medium size, solid, conical, spire slightly convex, colour pale buff. Exact nature of protoconch not distinguishable, as the summit of the type is slightly worn. Mature whorls 7, short, not turreted, slightly rounded, sutures shallow. Sculpture of irregular, ill-defined axial ribs on the earlier whorls, becoming very faint on the later whorls, which are practically smooth except for some faint spiral threads. A weak varix is present on the penultimate whorl, suggesting a former complete aperture and a renewal of growth. Aperture ovate, angled posteriorly, only slightly oblique, the outer margin thickened internally and with a very slight external varix, columella with a shallow sinus. Length 8-6 mm.
Locality.—Port Curtis (J. Laseron), holotype.

Remarks.—This is close to M. persista in many characters, but it is a larger, broader, and more solid shell, with the axial sculpture weaker and less regular and persistent.