214 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Type in United States National Museum, No. 110478. Type locality, 
Station 4797, in 682 fathoms, Okhotsk Sea. 
Range. Western Bering Sea, off Starichkoff Island. 
Colus ombronius Dali, 1919 
Plate 9, fig. 5 
Proceedings of the United States National Museum, 56:315. 
Shell of moderate size, white with a dull olive-gray periostracum, of 
more than six well-rounded whorls, the nucleus missing, the aperture 
longer than the spire; suture distinct; not appressed; axial sculpture of 
rather strong, regular and regularly spaced incremental lines, which 
minutely corrugate the spirals; spiral sculpture of (on the penultimate 
whorl, about a dozen) flattish cords, equal and equally spaced with much 
narrower interspaces; on the last whorl, especially near the periphery, 
these cords have a tendency to become keeled and the interspaces wider; 
aperture ovate, simple, the outer lip slightly expanded and reflecting the 
external sculpture, throat white, inner lip enameled, pillar twisted, almost 
pervious; canal two-thirds as long as the rest of the aperture, well-re¬ 
curved. Height of shell, 50; of last whorl, 37; of aperture, 30; diam., 
21 mm. (Dali.) 
Type in United States National Museum, No. 213239. Type locality, 
United States Fish Commission Station 3252, in Bering Sea. 
Range. Eastern Bering Sea, from Nunivak Islands to Bristol Bay and 
Pribilof Islands. 
Colus bristolensis Dali, 1919 
Plate 8, fig. 8 
Proceedings of the United States National Museum, 56:316. 
Shell small, white, under an olivaceous periostracum, with six rounded 
whorls and a very minute (decorticated) nucleus; suture distinct, not 
appressed; spiral sculpture of (on the penultimate whorl, about 14) shal¬ 
low grooves, becoming fainter on the last whorl, with much wider flat 
interspaces; axial sculpture of faint incremental lines; aperture wide, 
semilunate, the outer lip sharp, thin, arcuate; body with a thin coat of 
whitish enamel; pillar short, twisted, attenuated in front; canal short, 
wide, recurved. Height of shell, 23.5; of last whorl, 18; of aperture, 13; 
diameter, 11.5 mm. (Dali.) 
Type in United States National Museum, No. 213254. Type locality, 
United States Fish Commission Station 3252, in Bering Sea. 
Range. Pribilof Islands to Unimak Island, Alaska, in 27-62 fathoms. 
[214] 
