Shell small to moderate sized, 14 - 18 mm., narrowly fusiform, with a tall spire and a moderately long unnotched slightly flexed anterior canal. Sinus broad, retracted to a rather narrowly U-shaped apex, which is just below the middle of the shoulder slope. Protoconch blunt, paucispiral, of slightly more than two whorls; first smooth, dome-shaped, second with four spiral cords. Outer lip thin; inner lip without a parietal tubercle or callus pad. Adult sculpture of prominent fold-like axials, restricted to the peripheral area, and rather strong spiral cords, that override the axials. Operculum leaf-shaped, with a terminal nucleus. Radula of modified wishbone-type, consisting of a pair of marginals, in which one of the basal limbs is severed. The result is a large elongated elliptical tooth, partially overlaid by a slightly shorter but much more slender member (M. ahiparana). The genus is somewhat of clavinid facies, except for the style of sinus and absence of a parietal tubercle, but its true relationship seems to be with the turriculinids, near to Comitas. Range — New Zealand, Recent and Pleistocene.