Shell elongated, slender, with six moderately rounded whorls, reticulately sculptured and covered when fresh with a rather coarse brown fibrous epidermis; whorl transversely sculptured with from fourteen to twenty narrow, clear-cut, moderately elevated, even, slightly flexuous ribs, crossing the whorls, but less prominent anteriorly and separated by wider interspaces. The only other transverse sculpture is of lines of growth; spiral sculpture of (between the sutures nine to ten) narrow, flat-topped, strap-like elevated cinguli, with wider excavated interspaces, rather uniformly spread over the whorl, but more distant near the .shoulder, and on the earlier whorls somewhat sharper and relatively more prominent. Between the cinguli, and rarely on them, are a few obscure, revolving-lines. On the canal the cinguli become rounded, smaller and obscure. The surface under the dehiscent epidermis is polished pale brown, with a somewhat chalky substratum easily eroded. The upper whorl or two have lost most of this layer in the specimen figured and the nucleus is lost. The suture is deep, but not channeled. The canal has no constriction behind it. The aperture is rather long, the outer lip but slightly reflected and a little fluted by the spiral sculpture. Inside there are a few faint and obscure lirae. The throat is pure white; the thin body callus, tinged with pale-pinkish brown. The anterior angle of the aperture is nearly canaliculate, and produces a perceptible siphonal fasciole. The pillar is straight and strong, with two plaits; the posterior stronger, both oblique and rather low. The angle of the edge of the pillar, though not elevated, might by some be taken as an obscure third plait. At the end of the plaits on the callus of the pillar are a number of small shelly pustules like on C. cassidiformis. Long, of shell, 43; max. alt., 21 mm. (Dall.)

Type locality, Drake's Bay, near San Francisco, California.
RANGE. Bodega Bay to San Diego, California.