Shell large for the genus, depressed, white; nuclear whorls 2, rounded, smooth, shining; postnuclear whorls 2,5 sculptured with closely spaced, equal, spiral threads crossed by much finer, incised, axial lines; sutures flatly impressed, periphery well rounded; body whorl produced, aperture oblique, outer lip thickened at the edge, with a blunt point at the junction with the elongated basal lip, which continues as a broad callus over the body of the shell, extending to the periphery; umbilical area covered with the heavy tongue of callus, extending from about the middle of the basal lip and extending nearly to the periphery, wider and bulging over the middle of the umbilical area; exposed portion of the base moderately rounded, sculptured similar to the spire, with in addition a series of broad folds extending from a little below the periphery to the edge of the umbilical callus, becoming much less pronounced as they recede from the basal lip of the aperture. The type measures: maximum diameter, 3.5 mm.; height, 1.6 mm.
Holotype near Port Parker. Costa Rica, Lat. 10° 56' 05" N., Long. 85° 49' 25" W., dredged in 15 fathoms (27 meters), sandy mud, crushed shell.