Shell highly sculptured, reaching a rather large size, about 21 mm. in length, and medium in height, the latter being about one hall" of the length. Color a pure or yellowish white. Base rather broadly elliptical or ovate. Anterior slope convex, posterior slope concave. Apical whorls prominent, from one and three quarters to two and one quarter, increasing rapidly in diameter, with the tip glossy, the rest opaque. They lie below but close to the summit on the right side and immediately behind the center of the shell. The anal fasciole starts near the base of the apical whorls: it is deep, bordered by sharp edges and formed by rather widely-spaced incremental lamellae, which are much less numerous than the concentric cords that cross the shell. Fissure at the middle of the anterior slope, rounded behind and narrowing in front to a point. In young individuals the fissure is a slit, open in front. When they approach maturity both sides of the fissure unite leaving a fine groove between them. Sculpture consists of from 24 to 28 rather strong radiating ribs, starting at the base of the apical whorls. Lower down a secondary rib appears between each two of the primary ribs; they are at first rather fine, increasing in diameter until they equal the size of the primary ribs at the margin. Finally, a thread is intercalated between the primary and the secondary ribs. Two ribs, a little stronger than the rest, border the fine groove that extends from the lower end of the fissure to the margin. Numerous concentric cords cross the shell forming nodules where they intersect the ribs. The cords also divide the spaces between the ribs into more or less square and deep pits; this gives to the shell surface a lattice-like appearance. Margin finely denticulated. Interior of shell nacreous-white, and extending into the apical whorls. The primary ribs show through as shallow grooves which increase in depth as they approach the margin. The anal fasciole is marked by a thick callus. Internal septum convex, narrow and short, its length being less than half that of the fissure. A ridge is developed along each side of the fissure, continuous with the outer edge of the septum and extending to the margin. These ridges are separated beyond the fissure by the narrow groove mentioned above.

EASTEKN ATLANTIC: Gulf of Biscay along the north coast of Spain and off Portugal. WESTERN ATLANTIC: North Carolina and south to Saint Bartholomew, Lesser Antilles.