Shell small, slender, acute, black, or very dark reddish brown, with two smooth nuclear whorls, the second with a peripheral keel, and -even subsequent whorls; suture obscure, appressed, with a marked thread at its edge: spiral sculpture of fine spiral striae over the entire shell, and (on the spire two or three, on the last whorl eight) stronger cords undulated but not nodulated where they pass over the axial sculpture, and separated by wider interspaces: the anal fasciole hardly constricted; axial sculpture of line sharp incremental lines cutting the minor spirals and. on the last whorl about 13 low rounded ribs extending from the fasciole nearly to the canal but not conspicuous anywhere, with equal or narrower interspaces; aperture small, dark brown, the anal sulcus shallow and the thin outer lip only moderately arcuate; inner lip and pillar simple, canal short, hardly differentiated from the aperture. Height of shell, 9 mm, of last whorl. 4,5 mm diameter. 3,5 mm. Cat. No. 204102, U.S.N.M,
Range.—Beach of Taboguilla Island, Panama Bay.