,)A ll] new species oe shells 143 



brown ; body with a wash of callus ; pillar straight ; the voting some- 

 times have a small sharp ridge upon it ; canal wide, short, recurved, 

 with a well-marked fasciole; operculum pale brown, with subcentral 

 nucleus, small for the size of the shell. Lon. of shell, 57 ; of last 

 whorl, 37 ; of aperture, 25 ; maximum diameter, 25 mm. 



Station 5038, on the south coast of Nippon, in 175 fathoms, Octo- 

 ber 2, 1906; also at station 5049, in 182 fathoms. U. S. Nat. Mus., 

 110,515. 



This is nearest some varieties of B. polare, but more elevated, 

 slender, smaller, and differently colored. The ovicapsule is lentic- 

 ular, solitary, and about 10 mm. in diameter. 



BUCCINUM CNISMATUM Dall, n. sp. 



Shell small, thin, with about six whorls, rapidly increasing, whitish,, 

 with a very thin adherent brown periostracum ; suture narrow, deep, 

 almost channeled ; spiral sculpture of three progressively diminish- 

 ing strong, wide, ill-defined ridges, the first forming a shoulder near 

 the periphery, the interspace between it and the next anterior roundly 

 excavated, the second with the suture under it, the third and smallest 

 in the middle of the base ; between the suture and the shoulder the 

 slope of the whorl is flatfish ; the whole surface sharply microscopical 

 spirally striated, with the striae and intervals more or less fascicu- 

 lated ; aperture subtriangular, the outer lip modified by the sculpture, 

 slightly expanded ; throat and body glossy, pillar twisted ; canal 

 short, wide, recurved, forming a well-marked fasciole. Lon. of 

 shell, 38; of last whorl, 27; of aperture, 20; maximum diameter, 

 20 mm. 



Station 3331, in Bering Sea, north of Unalaska, in 350 fathoms. 

 U. S. Nat. Mus., 110,518. 



The sculpture of this curious shell is quite unique — the primary 

 ridges being neither carinate nor squared, but passing without any 

 demarcation into the slope of the interspaces. 



BUCCINUM DIPLODETUM Dall, n. sp. 



Shell small, thin, whitish, with a thin olivaceous more or less 

 fibrous periostracum and about six rapidly increasing whorls ; spiral 

 sculpture of a narrow, flat-topped, strong keel at the shoulder, fre- 

 quently another at or a little beyond the periphery, and sometimes 

 two smaller threads, between the suture and the shoulder ; secondary 

 sculpture of rather obscure flatfish spiral threads with equal or nar- 

 rower interspaces (but no sharp striation) covering the whole sur- 

 face ; suture distinct, not channeled or appressed ; aperture semi- 



