Shell minute to small, brittle, ovate, more or less bulbous, spirally striated especially at both extremities, and often covered with a thin periostracum; « a posterior sinus, but no sutural slit or anal fasciole; the interior not wholly visible from base. […] Principal stomach plates three. » – H. A. Pilsbry: Manual of conchology, structural and systematic ser.1 vol.15, Philadelphia 1895, p.351. Aperture broad anteriorly, longer than the shell, and narrowed at the posterior terminal.
 

Shell small, globose, with an aperture very enlarged anteriorly.
 

Shell minute, slender, date-shaped (Monterosato), radially and spirally microstriated; the columella is somewhat twisted anteriorly; posterior terminal narrow, anterior terminal rounded.
 

Shell minute, semi-globose, with strong spiral furrows at both ends, smooth elsewhere; columella weakly twisted anteriorly; posterior terminal projecting substantially from the apical area.