Shell having a strong superficial resemblance to Glyphostoma gratula, but with a totally different nucleus, and with differences in details of sculpture; it also has not the minute punctation ; color white or fishy gray ; nucleus and nuclear whorls heliciform, with a sculpture of slightly raised lamellae waved backward from the middle point of the periphery both ways; under these are also fine revolving raised lines ; whorls in all nine ; remainder with a transverse sculpture of from sixteen to (on the last whorl) eighteen narrow raised riblets passing entirely over the whorls, quite faint on the band and only obsolete on the columella and canal; beside these the lines of growth are unusually distinct, somewhat raised and rounded, and are especially well marked on the notch-band ; revolving sculpture consisting of three or four (on the last whorl thirteen) raised rounded threads slightly swollen where they cross the transverse riblets ; between these are usually two, but sometimes as many as four, similar but finer threads, which also invade the band and cover the pillar, but cross the riblets without enlarging; the interspaces between the ribs are less deep, and the whole sculpture more uniform and less prominent than in Glyphostoma gratula; suture appressed ; band less prominent than in the last; notch shallow, pillar nearly straight, canal very slightly recurved ; outer lip (not adult) thin. Long. of shell, 11.75 mm; of last whorl, 6.75 mm ; of aperture, 4.5 mm. Max. lat, 4.5 mm. DefL about 27°.

Gulf of Mexico