Shell rather large, reaching 190 mm. (7,5 inches) in length, imperforate, smooth, glazed and with a broad whorl shoulder. Color yellowish to orange, the more intense coloration exhibited on the ventral area. In addition, there are numerous, irregu¬lar, axial, zig-zag lines of a reddish brown coloration. Whorls 4 to 5, shouldered and nearly flat sided. Spire extended, acute and produced at an angle of about 50°. Aper¬ture long, nearly equal in length to the body whorl and subquadrate in outline. Outer lip thin. Parietal area heavily glazed. Columellar area with 3 or 4 generally unequal plicae. Suture slightly indented. Sculpture consisting of very tine and irregular growth lines. Protoconch of two small whorls, the first papilliform and covered by a "spur," a narrow prolongation which may be straight or curved and may extend as much as 20 mm. in length beyond the end of and following the shell axis. The radula is uniserial, with rachidian teeth only, each having three, sharp, subequal. pointed denticles in the same plane. This species ranges in shape and size from rather short and broad specimens to those which are a little narrower but proportionately far more attenuated. The animal possesses a rather broad loot and a mantle which can almost completely cover the outer surface of the shell. It is at this time when the mantle is fully extended that the spur is produced. It increases the length of the shell, being sometimes up to one inch long. According to B. Tursch (in letter) the body of the animal is mottled with dark green on a rich cream colored background.

Range. Cabo Frio, Est. Rio de Janeiro, Brasil, and south to the Gulfo San Matias, Argentina.