Bursidae in general have thick, ovate to slightly elongated shells are coarsely sculptured, resembling the triton shells of the Ranellidae. The intersection of the spiral ribs and the axial sculpture results in a strong nodulose pattern of more or less round knobs. This warty surface gave them their common name – frog shells. The outer varicose lip is dilated and shows a number of labial plicae, resulting in a toothed lip on the inside. The inner lip is calloused, showing transverse plicae. The anterior and posterior canals are well developed. The siphonal canal at the anterior end is usually short. The anal canal at the posterior end is a deep slot. The strong axial varices are often in two continuous series per whorl, one down each side of the shell. The nucleus of the corneous operculum is situated either at the anterior end or the mid-inner margin. A periostracum (hairy covering of the outer shell) is usually absent or thin.Frog shells are active predators, and appear to feed on bristle worms (Polychaeta) that they anaesthetize with acidic saliva through their extensible, distally flattened probosces.