CLASS GASTROPODA 
215 
Colus esychus Dali, 1907 
Plate 7, fig. 5 
Miscellaneous Collections, Smithsonian Institution, 50:159. Bulletin 112, United 
States National Museum; PI. 10, fig. 8. 
Shell slender, acute, solid, of a pinkish-brown color, and about eight 
moderately convex whorls; apex more or less eroded, acute, the suture 
not deeply constricted; sculpture of numerous fine, narrow, flattish spiral 
ridges, with a tendency to pair, separated by narrower, not channeled 
interspaces; the sculpture is distinct but not strong; there are about 25 
spirals on the penultimate whorl, of which perhaps one-third are rendered 
duplex by a radial groove; aperture ovate, livid pink, the outer lip slightly 
reflected; pillar slender, strongly twisted, and almost pervious; canal 
contracted and recurved. Long, of shell, 52; of last whorl, 33; of aperture, 
24; max. diam. of shell, 21; of aperture, 10 mm. (Dali.) 
Type in United States National Museum, No. 110479. Type locality, 
Stations 4791 and 4792, off Bering Island. 
Range. Point Barrow, Arctic Ocean, to Bering Island. 
Colus roseus Dali, 1877 
Plate 4, fig. 4 
Proceedings of the California Academy of Sciences, 7 :7. Scientific Results of the 
Exploration of Alaska; PI. 3, fig. 5, 1879. 
Shell small, of a rosy color when fresh, smooth to the touch, elegantly 
proportioned. Whorls six, well-rounded, but not inflated; suture distinct; 
apex not mammillate, but evenly and elegantly rounded off. Sculpture con¬ 
sisting of delicate, evenly distributed revolving grooves, with wide inter¬ 
spaces, of which there are thirty or forty on the last whorl; these are 
crossed by faint lines of growth. Aperture rounded-ovate, outer lip thin, 
columella arcuated, polished, not thickened; canal very short and wide. 
Fasciole none. Length, 0.9; width, 0.45 in.; spire a trifle shorter than the 
aperture plus canal. (Dali.) 
Type in United States National Museum. Type locality, Arctic Ocean. 
Range. Off Cape Lisburne, Arctic Ocean, 10-15 fathoms. 
This was described as a Chrysodomns. 
Colus barbarinus Dali, 1919 
Plate 8, fig. 5 
Proceedings of the United States National Museum, 56:316. 
Shell small, solid, pale gray, of about six whorls, the nucleus com¬ 
pressed axially and rather acute, suture distinct, not appressed, whorls 
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