CLASS GASTROPODA 
193 
Beringius crebricostatus Dali, 1887 
Plate 23, fig. 1 
Proceedings of the California Academy of Sciences, 7 :6. Scientific Results of the 
Exploration of Alaska; PL 2, fig. 1, 1879. 
Shell elongated, apex attenuated, blunt at the end; whorls (nuclear) 
three, (normal) four—total seven or more; texture porcellaneous; epi¬ 
dermis bright yellow-brown, shell beneath it, and at the aperture, white; 
columella nearly straight, smooth; outer lip hardly thickened, waved by 
the ridges. Sculpture composed by very prominent, revolving, flat-topped 
ridges, separated by channeled interspaces, which the ridges slightly over¬ 
hang. There are three of these ridges on the smaller whorls, and fourteen 
or more on the last whorl, of which the posterior four predominate in 
size and strength. The tops of the ridges are waved here and there, 
showing a tendency to traverse costae, which, however, are not present 
in any of the specimens. Top of the whorls squarely shouldered by the 
first ridge. On the ridges are usually one or two rather deeply incised 
lines, and a large number of delicate striae cover the whole surface parallel 
with the ridges. The cylindrical form of the embryonal whorls (which 
are free from strong ridges) is a remarkable character, but common 
to C. kennicottii Dali. Length, 3.5; greatest width, 1.65; length of aper¬ 
ture, 1.65 in. Canal very short, hardly differentiated from the aperture. 
Siphonal fasciole none, or barely perceptible. (Dali.) 
Type in United States National Museum. Type locality, Unalaska, 
in 100 fathoms. 
Range. Plover Bay, the Aleutian Islands, and eastward to Shumagin 
Islands, Alaska. 
This was described as a Chrysodomus. 
Beringius crebricostatus undatus Dali, 1919 
Proceedings of the United States National Museum, 56:311. 
Specimens (mostly young) differing from the typical form in having 
about 17 arcuate rounded ribs extending from the constricted suture to 
the periphery and obsolete on the base; there are also more numerous 
(about 18) spiral ridges, smaller and of course much closer together than 
in the case of the typical form. The apex of the largest specimen (about 
two-thirds grown) is defective, but there are five completed whorls, 
measuring 78 mm. long and with a diameter of 35 mm. (Dali.) 
Type in United States National Museum, No. 223031. Type locality, 
[193 1 
