182 NEW WEST AMERICAN SHELLS DALL. 



Cancellaria Crawfordiana, sp. nov. 

 (Plate VI, Fig. 1.) 



Shell elongated, slender, with six moderately rounded whorls, re- 

 ticulately sculptured and covered when fresh with a rather coarse 

 brown fibrous epidermis; whorls transversely sculptured with from 

 fourteen to twenty narrow, clear-cut, moderately elevated, even, 

 slightly flexuous ribs, crossing the whorls, but less prominent ante- 

 riorly 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 lime. 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 angular 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 those on 0. cassidiformis. Longitude of shell 43 ; maxi- 

 mum latitude 21 millimetres. 



Habitat: Drake's Bay, near San Francisco, California; dredged 

 alive by Mr. J. S. Arnheim, in 24 fathoms. Also by the U. S. Fish 

 Commission steamer Albatross at various points between San Diego 

 and San Francisco, in 20-30 fathoms. 



We are again indebted to Mr. J. J. Eivers, of the University of Cali- 

 fornia, for the opportunity of figuring and describing this fine large 

 shell, which forms an interesting addition to the mollusk fauna of Alta 

 California. It belongs to a group of Cancellarias rather abundantly 

 represented on the subtropical part of the Californian coast, but of 

 which no species has yet been found in a living state so far north be- 

 fore. This group includes C. fiffinis, urceolata, cassidiformis, and obesa. 

 The present species is nearest to G. urceolata, which is smaller with 

 much higher and more horizontal i)laits and somewhat different sculp- 

 ture and proportions. It is possible that G. urceolata in northern 

 waters grows larger and presents a modifie<l physiognomy, but the 



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