Shell elongated, acutely tapered, with fourteen or more rather inflated whorls of translucent whitish 'color ; transverse sculpture of some twenty-one slightly oblique rounded riblets with somewhat narrower interspaces, which are prominent on the periphery of the whorls, and evanescent toward the sutures ; these riblets are nearly parallel with the axis in the younger shells, and become more oblique in the adults ; each bears two nodules caused by the intersection of the spiral sculpture ; beside these there are faint lines of growth, most distinct on the polished and flattened base ; spiral sculpture consisting of a thread behind the suture, undulated by the ends of the transverse riblets in the young, simple and regular in the more mature whorls, and forming on the last whorl the margin of the base, and two flattened threads, separated by a wider groove, which rise to nodules where they intersect the transverse sculpture ; the distance from the suture forward to the posterior spiral thread is greater than from the anterior thread forward to the next suture, and this wider space has a somewhat excavated appearance, the posterior edge of the whorl being appressed to the suture, and slightly thickened where it meets the post-sutural spiral rib ; base flattened, yellowish, polished, with a single faint thread near the periphery ; aperture squarish, not completely developed in the specimens accessible ; canal very short ; pillar twisted, short, stout, of a darker yellow than the rest; apex decollated, probably rather pointed. Lon. of shelly 12.5. Max. lat. 3.0, Lon. of last whorl, 3.0 ; of aperture, 1.9. Lat. of aperture, 1.75; hat. of first remaining whorl, 0.87 mm.
Yucatan Strait, 640 fms.