dall: mollusca and brachiopoda. 309 



channelled ; sculpture of about ten narrow, prominent ribs, subspinose at the 

 shoulder, crossing the whorls, and separated by much wider interspaces ; these 

 are crossed between the sutures by four, and on the last wliorl by about fifteen 

 low, rather obscure, strap-like flattened ridges, with narrower interspaces, not 

 nodulous where they cross the ribs ; those on the base smaller and closer together ; 

 aperture wide, pillar short, twisted, keeled at the anterior edge ; inner lip with a 

 thin layer of smooth callus. Length of three whorls, 5.5; max. diam. 4.0 mm. 



U. S. S. " Albatross," station 4641, near the Galapagos Islands, in 633 fathoms, 

 ooze, bottom temperature 39°. 5 Y. U. S. N. Mus. 110,630. 



Although this specimen is quite defective, enough of it remains to characterize 

 the species, and to distinguish it from any other forms of the genus known from 

 the region. In form the species is not unlike Nassa ephamilla Watson, but the 

 sculpture is difi'erent and there is only one row of spines or pointed nodules. 



CohLmhcllidae. 



COLinflBELLA Lamarck. 



Columbella (Anachis) fusidens Dall, n. ep. 



Plate 11, figure 13. 



Shell of moderate size, slender, acute, of a pale brown or brownish white, with 

 a thin, smooth periostracum ; whorls five and a half without the (lost) nucleus; 

 suture distinct, not deep ; axial sculpture of (on the last whorl thirteen) narrow, 

 rounded nearly vertical ribs with subequal interspaces extending from suture 

 to suture and on the last whorl to the base ; spiral sculpture none above, obso- 

 lete on the base, a few strong threads on the canal and finer ones on the siphoual 

 fasciole ; aperture narrow, contracted ; outer lip slightly thickened, within it and 

 parallel to the edge is a ridge of callus more or less continuous and striated so as 

 to appear as if composed of five or six fused denticles ; in the type specimen this 

 ridge is broken into two parts, the shorter anterior ; in other specimens it is con- 

 tinuous ; body and pillar with a rather thick layer of callus, obsoletely trans- 

 versely striated, in some specimens possibly dentate, its outer anterior edge 

 slightly raised ; pillar nearly straight, canal very short, slightly recurved. Lon. 

 of shell (without the nucleus), 15.0; of last whorl, 10.0; of aperture, 7.0; max. 

 diam. 6.0 mm. 



U. S. S. " Albatross," station 464'2, four miles east of Ripple Point, Hood 

 Island, Galapagos Islands, in 300 fathoms, globigerina ooze, bottom temperature 

 48°.6 F. U. S. N. Mus. 110,616. 



The most striking cliaracteristic of the species is the contracted mouth, with 

 the internal denticles as if melted together. There is nothing which closely re- 

 sembles it known from the region. C. iodostoma Gaakoin, from the ludo-Pacific 

 region, is somewhat similarly contracted. 



