Shell of moderate size of six or more whorls, the apex eroded, white, with a cream-colored periostracum; spiral sculpture of numerous fine, subequal, flattish threads with narrower interspaces, which cover the whole shell; to these are added a thickened ridge which borders the anterior margin of the suture, and on the spire a peripheral nodose keel, which is less marked on the last whorl, where it forms the shoulder; on the penultimate whorl there are twenty of these nodules ; other axial sculpture is furnished by five, short, sharp elevated wrinkles which cross retractively the ridge adjacent to the suture, like the "gathers" of a skirt, and become obsolete on the fasciole; there are twenty-eight of these wrinkles on the margin of the penultimate whorl; the space above the shoulder is distinctly excavated, especially on the spire; suture distinct and, on the earlier whorls, almost channelled; aperture ovate; anal fasciole comprised in the nodose shoulder, not reaching the suture; outer lip arcuately produced forward; pillar with a thin, smooth layer of enamel, obliquely attenuated distally, somewhat twisted; canal wide, shallow. Length of shell 25 mm.; of last whorl, 19 mm; of aperture, 14.5 mm; max. diam. 12.5 mm.

Galapagos Islands.