The shell is large (maximum length 150 mm) and globose. The spire is moderately low, consisting of two and one-half nuclear whorls and six convex postnuclear whorls. The suture is obscured by the succeeding whorl. The body whorl is large and globose. The aperture is large and ovate, with a deep, broad anal sulcus extending posteriorly to the shoulder of the preceding whorl. The outer apertural lip is coarsely dentate and strongly erect; its interior is moderately to weakly lirate. The columellar lip is expanded posteriorly into an adherent parietal callus, this detached and strongly erect anteriorly, forming a prominent inductura, the edge of which is horizontally furrowed or crumpled; along the columellar axis are six to ten weakly to moderately well-developed denticles. The siphonal canal is moderately long, slender (for the genus), narrowly open at the right, and strongly recurved for one-half its length.
The body whorl bears four or five spinose varices. Axial sculpture otherwise consists of a single slender, knobbed ridge in each intervarical space. Spiral sculpture consists of six or seven prominent cords, these forming raised knobs on the intervarical ridges and turning up into sharp, open spines over the varices; the uppermost spine, at the shoulder margin, is much longer than the others, and its hollow body is confluent with the aperture. There is also a microsculpture consisting of fine, irregular spiral threads and fine axial lamellae, these elevated into fine scales where thev cross the threads.
Shell color is flat white, exaggerated in its flatness by the microsculpture. The interior of the aperture, the inductura, and the interior of the upper portion of the canal are rich pink. In young specimens the three brown spiral bands typical of the genus are apparent, particularly the upper and lower bands; these are not visible in mature shells.

Northern Gulf of California to Peru.