Shell small, white, hexagonal, with a blunt glassy nucleus of a whorl and a half and about five subsequent whorls; surface showing no spiral sculpture under a hand lens; axial sculpture of six strong rounded ribs, running the whole length of the shell and continuous over the spire; suture distinct; aperture narrow, with a relatively large rounded anal sulcus, a thickened outer lip without internal liration. The inner lip simple not callous, the pillar short, the canal hardly differentiated. Height of shell 6 mm.; of last whorl, 4.5 mm.; diameter, 2.5 mm.

Galapagos Islands. Indefatigable Island.