Range — Recent, deep water, 1200-1300 fathoms, Gulf of Panama to Ecuador, and undescribed species from off Hawaii.

Shell small to medium sized, 8-28 mm., broadly fusiform but with a short twisted anterior canal. Weak axial ribs are produced into rounded nodules on a conspicuous peripheral keel. The sinus is at the periphery, rather slight and square-cut at the apex of a broadly open V. Apical whorls unknown. The shell is covered by a greenish-grey periostracum. Operculum oval, with a terminal nucleus. Radula of modified wishbone-type, marginals only, which are long and slender, with the distal limb severed.