236 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
seltner aber ziemlich ausgeragt, wonach ich folgende zwei Formveran- 
derungen dieser Varietat unterscheide. (Middendorff.) 
Shell rufescent, all the radial whorls angulately carinated; with the 
two or three last whorls nodose; with the carina toward the last whorl 
disappearing more and more, with the nodes (8 to 10 on each whorl) 
increasing in the same sense. 
According to my experience this is the most common species, which 
also has the greatest distribution. Generally the keels and nodes are 
only indistinctly emphasized as external sculpture; more seldom, however, 
rather strongly developed, according to which I distinguish two changes 
of form of this variety. (Middendorff.) 
Type in Academy, St. Petersburg. Type locality, Arctic. 
Range. Point Barrow, Arctic Ocean, to Bering Sea. 
Chrysodomus saturus tabularis Dali, 1919 
Plate 12, fig. 6 
Proceedings of the United States National Museum, 56:323. 
Shell of moderate size, very heavy and solid, the six whorls flatly 
tabulate in front of the suture, rude, of a grayish color, the nucleus lost; 
the suture distinct, not appressed; the apical whorls finely spirally closely 
threaded, but the rest of the shell without sculpture except rude incre¬ 
mental lines; aperture rounded, outer lip heavy, body and very short pillar 
with a thick coat of enamel; canal short, very narrow and deep, recurved, 
with wide umbilical cavity between a very prominent fasciole and the 
enamel of the pillar. Height of shell, 62; of last whorl, 50; diameter, 
44 mm. (Dali.) 
Type in United States National Museum, No. 31350. Type locality, 
Bering Sea, near Nunivak Island. 
Range. Pribilof and Nunivak Island, Bering Sea. 
Chrysodomus solutus Hermann, 1781 
Der Naturforscher, 16:53; PI. 2, figs. 3, 4. 
Testa ovata, varieibus ventris longitudinalibus inaequaliter distantibus, 
labio canaliculo subsoluto. (Hermann.) 
Shell ovate, with ventral longitudinal varices unequally distant, inner 
lip with small canal somewhat free. (Translation.) 
Type in? Type locality, Arctic. 
Range. Mackenzie River delta west to Point Barrow and south to 
Bristol Bay, Bering Sea. 
[236 ] 
