144 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



lunar, outer lip thin, slightly reflected ; throat, body, and pillar glossy 

 white ; pillar short, straight ; canal very short and wide, recurved, 

 with an obscure fasciole ; operculum well developed, pale, with the 

 nucleus near the middle of the outer edge. Lon. of shell, 38 ; of last 

 whorl, 26; of aperture, 17; maximum diameter, 21 mm. 



Station 3074, off Sea Lion Rock, coast of Washington, in 877 

 fathoms. U. S. Nat. Mus., 110,517. 



This is a very elegant and rather variable little species. 



BUCCINUM EPISTOMIUM Dall, n. sp. 



Shell of moderate size, solid, capacious, not constricted at the 

 suture, with about six whorls, covered with a closely adherent 

 smooth, unpolished, yellowish periostracum ; apex defective ; spiral 

 sculpture of numerous, uniform, flattish spiral threads, with nar- 

 rower, minutely channeled interspaces, about 3 to a millimeter ; spire 

 conic, the edge of the whorl more or less minutely puckered in front 

 of the suture ; aperture wide, rounded ; throat purplish brown ; 

 outer lip very thick, white, somewhat reflected ; body and 

 pillar with little or no callus ; pillar straight ; canal wide, re- 

 curved, with a slight fasciole; operculum large, very thin, yellowish. 

 Lon. of shell, 57 ; of last whorl, 40 ; of aperture, 28 ; maximum 

 diameter, 35 mm. 



Station 4804, off Cape Rollin, in 229 fathoms. U. S. Nat. Mus., 

 110,519. 



An extremely well-marked and distinct species. 



BUCCINUM SIGMATOPLEURA Dall, n. sp. 



Shell subconic, narrowly turreted, smooth, with about six whorls ; 

 spiral sculpture none ; axial sculpture of, on the last whorl, about 

 thirty low, rounded, sigmoid ribs with subequal interspaces, extend- 

 ing from the shoulder to the canal ; suture distinct, the whorl in 

 front of it narrowly tabulate, but the outer margin of the tabulation 

 evenly rounded off, outer layer of the shell chalky, eroded ; toward 

 the base and aperture the layer beneath is more or less colored with 

 purple-black, which also colors the tops of some of the ribs ; aper- 

 ture white, the outer lip not fiexuous, white, callous, hardly reflected ; 

 body and pillar with a marked callus ; pillar arcuate ; canal large, 

 deep, recurved, almost as in A T assa, making a strong fasciole with a 

 sharp keel at its hinder edge. Lon. of shell, 60; of last whorl, 41 ; of 

 aperture, 29; maximum diameter, 30 mm. 



Station 4792, off Bering Island, in J2 fathoms. U. S. Nat. Mus.. 

 110,520. 



