Ovulid-like shells, small, with some sculpture which is mainly spiral (Lunovula, Pedicularia, Pseudocypraea etc.) except in the genus Jenneria Jousseaume, where the spirals (indeed present) are covered with numerous pustules; the outer lip is often strongly denticulate.
 

« Shell small, limpet-like, irregular, with a short spire which becomes concealed with the growth, the surface radiately ribbed when young; mouth large and wide, subcanaliculated in front, the lips irregular, simple in the adult, the inner one callously excavated, no operculum. » – G.»W.»Tryon: Manual of conchology, structural and systematic ser.1 vol.7, Philadelphia 1885, p.241. The comparison with the limpets can come from the habit that these animals have of digging a lodge at the surface of their host, or prey. But the shell itself is much more irregular than any limpet, and possesses a spire. Aperture widely expanded laterally; spire narrow.