The suture is distinct, closely appressed, undulated by the axial sculpture.

The axial sculpture consists of (on the body whorl 10) rounded sigmoid ribs, feebler where they cross the fasciole, fading out on the base, and most prominent at the periphery, with subequal interspaces.

The anal sulcus is large, close to the suture, with a thick subsutural callus.

The outer lip is thickened with no internal lirae, a knob-like varix a little way behind it.

[3] This species occurs in the Gulf of California, Western Mexico.