152 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



This fine species belongs to the same general group in the genus 

 as the last, but is strongly contrasted with it in many details. 



BUCCINUM OROTUNDUM Dall, n. sp. 



Shell acute, short, very wide, of a creamy or pinkish white, cov- 

 ered with a thin dehiscent periostracum, having about six whorls ; 

 suture distinct, appressed, with a few small irregular axial plications 

 in front of it, especially on the apical whorls ; spiral sculpture of 

 low, fine, sharp, subequal threads, of which a few, especially near 

 the canal, are more prominent, having three or four less prominent 

 ones between them ; the interspaces are, as a rule, wider, and are 

 reticulated by incremental lines ; aperture wide, patulous, yellowish 

 within ; outer lip thin, sharp, expanded, flexuous behind, slightly 

 thickened within ; body white, glossy ; pillar white, arcuate, with a 

 thin layer of callus ; canal wide, deep, recurved, forming a con- 

 spicuous fasciole with a wide channel behind it ; operculum large, 

 brown, with a subcentral nucleus. Lon. of shell, $, 60; of last 

 whorl, 50 ; of aperture, 39 ; maximum diameter, 40 mm. 



Station 3254, in 46 fathoms, north of Unimak Island, Bering Sea ; 

 bottom temperature, 36 .2 F. U. S. Nat. Mus., 110,538. 



This belongs to the group of B. polarc, but is far more expanded 

 and devoid of the strong keels which characterize typical polarc. 



BUCCINUM FUCANUM Dall, n. sp. 



Shell small, solid, short-conic; spire acute, with a constricted 

 suture and about seven whorls ; color pale brownish over a white 

 chalky substratum; suture not appressed or channeled, with (on the 

 last whorl 21) faint, narrow, low, flexuous plications in front of it, 

 which become obsolete on the periphery ; the incremental lines,, 

 though almost microscopic, are sharp, close, regular, and elevated,, 

 forming a distinct feature of the sculpture; spiral sculpture of small, 

 flat fasciculi of four or five threads each, the fasciculi separated by 

 deeper grooves about half the width of a fasciculus ; this sculpture 

 requires a lens to make it out and is quite uniform over the surface ; 

 aperture wide, white; outer lip expanded, reflected, and thickened, 

 somewhat excavated behind ; body with a thin white callus ; pillar 

 short, twisted, not pervious ; canal wide, short, recurved, forming a 

 moderately distinct fasciole ; operculum thin, the nucleus midlateral 

 or nearly so. Lon. of shell, 45; of last whorl, 34: of aperture, 27,; 

 maximum diameter, 27 mm. 



Station 3452, in 125 fathoms, Fuca Strait ; bottom temperature,. 

 44 . 5 Fahrenheit. U. S. Nat. Mus.. 130,426. 



A pretty little species of the B. plectrum group. 



