Shell large, up to 75 mm in height, thin, bulbous, with flat or slightly sunken spire and very expanded body whorl. Aperture moderately wide, constricted anteriorly, outer lip thin and crenulated by the ridges ending on it, columella with callus, which partly obscures the deep. wide open umbilicus, strong fasciole, siphonal canal short and broadly open. Sculptured with rounded spiral ridges that increase in size and widely separated towards anterior end, fine spiral threads in between the ridges on the top and fine axial lamellae at the bottom. Colour uniformly cream.