252 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
the fasciculi of the spire elevated until they resemble striated threads; 
color pale livid-brown, without color-bands; whorls eight; outer lip thin, 
slightly expanded, and in front thickened with a white border; throat 
brownish; body and pillar glossy, not callous; canal short, wide, recurved 
with a strong fasciole with a groove behind it, but no keel. Long, of 
shell, 38; of last whorl, 25; of aperture, 17; max. diam., 17 mm. (Dali.) 
Type in United States National Museum, No. 110533. Type locality, 
Station 4779, on the Petrel Bank, Bering Sea. 
Range. Petrel Bank, Bering Sea, in 43-54 fathoms. 
Buccinum sigmatopleura Dali, 1907 
Plate 14, fig. 5 
Miscellaneous Collections, Smithsonian Institution, 50:144. Bulletin 112, United 
States National Museum; PI. 12, fig. 6. 
Shell subconic, narrowerly 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, extending 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; aperture white, the outer lip not flexuous, white, 
callous, hardly reflected; body and pillar with a marked callus; pillar 
arcuate; canal large, deep, recurved, almost as in Nassa, making a strong 
fasciole with a sharp keel at its hinder edge. Long, of shell, 60; of last 
whorl, 41; of aperture, 29; max. diam., 30 mm. (Dali.) 
Type in United States National Museum, No. 110520. Type locality. 
Station 4792, off Bering Island. 
Range. Commander and Attu Island, Bering Sea. 
Buccinum rossellinum Dali, 1919 
Proceedings of the United States National Museum , 56 :327. 
Shell small, very thin, of a dull-olive color, the suture deep, not ap- 
pressed; with about six well-rounded whorls, the apex eroded; axial 
sculpture of fine, close, even, silky incremental lines; spiral sculpture of 
fine, close, equal flattish threads on the spire which later take on the 
aspect of rather wide flat interspaces between shallow grooves, here and 
there with a slightly more elevated spiral thread; aperture ovate, outer 
lip thin, sharp, perhaps not quite mature; inner lip white, erased, pillar 
short, twisted; canal very short, slightly recurved, wide, with a faint 
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