188 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
curved; aperture wide, the outer lip thickened but hardly reflected, throat 
whitish; body in the mature shell with a layer of whitish enamel which 
extends to the end of the pillar, which is arcuate, shorter than the aper¬ 
ture, and obliquely truncate in front. Height of shell, 114; max. diam., 
65 ; height of last whorl, 87; of aperture, 75 mm. (Dali.) 
Type in Ottawa. Type locality, Station 24, Point Barrow, Alaska. 
Range. Arctic Ocean to Pribilof Islands, Bering Sea. 
Volutopsius rotundus Dali, 1919 
Plate 22, fig. 4 
Proceedings of the United States National Museum, 56 :310. 
Shell large, slender, rather thin, with a distinct, almost constricted 
suture and more than five rounded whorls (the extreme apex defective) ; 
white or pinkish with a thin, dehiscent, pale straw-colored periostracum; 
axial sculpture on the apical whorls of a few, irregular, low plications, 
mostly with narrower interspaces; on the rest of the shell only irregular 
incremental rugosities; spiral sculpture on the last whorl behind the base 
of a half-dozen obscure low cords with wider interspaces; on the base 
these cords number about 15, becoming more regular and close anteriorly; 
the canal is still more finely and closely threaded; aperture elongate, outer 
lip thin, body and pillar erased; canal short and wide. Height of four 
whorls, 105 ; of last whorl, 75; diameter, 40 mm. (Dali.) 
Type in United States National Museum, No. 206350. Type locality, 
Kodiak Island, Alaska. 
Range. Kodiak Island to Cook’s Inlet, Alaska. 
Volutopsius middendorffii Dali, 1891 
Plate 10, fig. 1 
Proceedings of the United States National Museum, 14:186; 17; Pi. 28, fig. 1, 1894. 
Closely resembling Strombclla norvegica, but sharply, finely, spirally 
incised all over, and when adult, with a strong, red, yellow or brown 
reflected lip. Probably Tritoniuni norvegicum Midd. (not Chemnitz). 
The sculpture is of sharp, fine grooves, not the obsolete spiral striae occa- 
sionaly seen on 5'. norvegica . Length, 110; breadth, 60 mm. (Dali.) 
Type in United States National Museum. Type locality, Stations 
3216 and 3253, off Unimak Pass, Alaska, in 36-61 fathoms. 
Range. Known only from type locality. 
This was described as Strombella middendorffii. 
[ 188 ] 
