Shell yellowish-white, with a dull surface, except for the glassy and translucent nucleus, slender, thin, eight-whorled; nucleus thin, inflated, the (nuclear) first two whorls polished, smooth, and free from sculpture, passing abruptly into the dull and lustreless surface of the adult shell ; for the remainder, the transverse sculpture consists of subequal ribs, largest on the periphery, smaller toward the sutures, which they reach above and below, the track of the notch not being marked by a flattened band, as is generally the case ; there are about eleven of these to a whorl, on the last whorl they are less pronounced, and become obsolete toward the anterior third of the whorl, where the lines of growth are particularly conspicuous ; the completion of the adult aperture is marked by a particularly large rib or swelling of the margin, which becomes more conspicuous in case the shell continues to grow; in the older part of the shell the ribs are continued in the same line from whorl to whorl, in the last whorl and a half they become alternate or irregular ; the revolving sculpture consists of (on the smaller whorls) two or three to (on the last whorl) sixteen flattened raised bands, with wider interspaces, which are much more marked, or even knobby, on the smaller whorls where they pass over the transverse ribs, gradually become more uniform, and, on the last whorl, are nearly as well defined between the ribs as on them ; nine of those on the last whorl are crowded together on the anterior third, the rest spread over the body of the whorl; there are hardly any traces of revolving striatum ; notch deep, but not producing a band ; margin of the aperture thin, the outer lip produced forward, a slight deposit on the body and pillar ; columella nearly straight, slightly shorter than the rather wide, somewhat recurved canal ; sutures appressed, sinuous over the ends of the transverse ribs ; aperture less than one third of the shell. Lon. of shell, 9.5 mm; of last whorl, 5.0 mm; of aperture, 3.0 mm. Max. lat. 3.5 mm. Defl. about 27°. A rough-looking little shell, with somewhat the sculpture of a Cerithiopsis.

Caribic. Cuba.