CLASS GASTROPODA 
227 
Colus dalmasius Dali, 1919 
Plate 13, fig. 9 
Proceedings of the United States National Museum, 56:322. 
Shell of moderate size, acute, white covered with a dark reddish- 
brown periostracum with a subglobular polished nucleus of about one 
whorl, and six subsequent well-rounded, rapidly enlarging whorls; suture 
distinct, not appressed ; axial sculpture of feeble incremental lines; spiral 
sculpture of numerous flattened threads with narrow, obscurely channeled 
interspaces, coarser on the canal; aperture wide, outer lip thickened, 
arcuate, slightly expanded; body with a thin white layer of callus, pillar 
short, twisted; canal short, strongly recurved. Height of shell, 35; of 
last whorl, 25; of aperture, 18; diameter, 20 mm. (Dali.) 
Type in United States National Museum, No. 122631. Type locality, 
United States Fish Commission Station 2862, off coast of British Columbia. 
Range. Off British Columbia in 238 fathoms. 
Genus CHRYSODOMUS Swainson, 1840 
Shell large, short-fusiform, smooth or spirally sculptured, sometimes 
with rude axial ribbing or nodosities or varix-like sharp laminae; outer 
coat of the shell subtranslucent, the inner layer with a darker, usually 
purplish tint, the periostracum inconspicuous and dehiscent; last whorl 
longer than the spire, with a wide aperture, the outer lip in the adult flar¬ 
ing or subreflected, not thickened; pillar flexuous, smooth ; labrum without 
callosities o rlirae; inner side of the outer lip without liration in the typical 
group; the canal rather long, wide, open, and flexuous. (Dali, 1919.) 
Type. Mur ex antiquus Linnaeus. 
Distribution. Circumpolar, Pacific and Atlantic, Europe, Asia, 
America. Fossil: Pliocene—Britain, Sicily; Pleistocene and Pliocene— 
California; Miocene—California and Oregon. 
Subgenus Sulcosipho Dali, 1916 
Chrysodomus tabulatus Baird, 1863 
Plate 4, fig. 5; Plate 18, fig. 4 
Proceedings , Zoological Society of London, 6. Proceedings of the United States 
National Museum, 24; PI. 36, fig. 9, 1902. 
Shell large, fusiform; spire elevated; apex subacute; whorls eight, 
sharp angulated and keeled above, forming a rimmed, spiral table ; surface 
ornamented with revolving ridges of alternating size; suture very deeply 
impressed; aperture pyriform; outer lip thin, smooth; inner lip incrusted ; 
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