228 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
canal long, narrow, curved backward; columella twisted, spirally ridged. 
Length, 116; diameter, 46 mm. (Baird.) 
Type in British Museum. Type locality, Puget Sound. 
Range. British Columbia to San Diego, California, 46-218 fathoms. 
SECTION CHRYSODOMUS s.s. 
Chrysodomus amiantus Dali, 1889 
Proceedings of the United States National Museum, 12:321; PI. 5, fig. 10. 
Shell large, thin, white, with six whorls and a small but prominent 
inflated subglobular nucleus; spiral sculpture of numerous close-set 
rounded narrow ridges, of which part are larger than the others; on the 
early whorls two or three of the primaries are conspicuous on the periph¬ 
ery, with one or two finer ones intercalated; later the peripheral spirals 
merge with the other primaries, as to size and prominence, and on the 
last whorl there are four or five intercalary threads between the primaries, 
the space between the latter, from center to center, averaging 2.5 mm. 
to each set; transverse sculpture shows only in fine, slightly irregular lines 
of growth; the whorls from and including the third are inflated, and the 
suture, though not channeled, is strongly marked; the canal is short and 
recurved, the siphonal fasciole indistinct; the aperture is wide, the outer 
lip, prominent in the middle, receding toward the suture, and the canal, 
smooth, not thickened, whitish internally; inner lip concave, with a thin 
glaze of polished callus, slightly brown-tinted; pillar twisted and the axis 
minutely pervious; the aperture longer than half the shell; operculum 
brown, moderately stout, apically pointed. Max. long, of shell, 76; max. 
lat., 43; long, of aperture, 45 mm. (Dali.) 
Type in United States National Museum. Type locality, Station 2839, 
near Santa Barbara Islands, in 414 fathoms. 
Range. Pribilof Islands, Bering Sea, to Monterey Bay, California. 
Chrysodomus insularis Dali, 1894 
Plate 25, fig. 3 
Proceedings of the United States National Museum, 17:707; PI. 5, fig. 10. 
Shell large, solid, rather thin, with about six whorls exclusive of the 
(decollate) nucleus; whorls full, rounded, slightly excavated in front of 
the appressed suture; sculpture of, on the last whorl, three sizes of flattish 
rounded threads, alternating regularly in size, but on the upper whorls of 
only two alternated sizes separated only by shallow grooves; transverse 
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