Shell very large,thin, globose, sutures canaliculated, spire low, and body whorl inflated. Aperture very wide, showing spiral depressions corresponding to the ribs on the dorsal surface, outer lip simple, thin and fluted, columella almost straight, without a parietal shield, twisted conspicuously on the basal part, umbilicus open and deep. Sculptured with broad, flat, raised, widely spaced spiral ribs, two to three on the penultimate whorl and about thirteen to fourteen on the body whorl, with threads in the intermediate spaces. Colour white to cream, ornamented with rectangular or quadrate orange brown spots on the ribs, apex and aperture brown