Shape of the dorsal side (A–D), position of aperture profile compared to the shell axis in lateral view (E–G), method of measuring the umbilicus (H) (D: shell diameter, UD: umbilicus diameter), apertural axis (red line) compared to the shell axis (white line) in frontal view (I–K) and differences of body whorl shape in apertural view (L–N) A conical B concave-conical C conical-globular D domed E slightly oblique F moderately oblique G strongly oblique I small angle J moderate angle K large angle L rounded M depressed-rounded N shouldered.