106 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Astarte rollandi loxia Dali, 1903. 
Proc. U. S. N. M. y 26:943. 
This is a pale oblique variety, which is found on oceanic islets. (Dali.) 
Type in U. S. N. M. Type locality, Chika, the Semidis and Middleton 
Islets. 
Range. Semidi Islands, Alaska. 
Astarte arctica Gray, 1824. 
App. Parry’s Voy., p. 243. Sars , Moll. Reg. Arct. Norv., pi. 5, fig. 8. 
Shell elliptical-suborbicular, sub-compressed, rather irregularly ridged 
near the umbos and at the middle, smooth toward the margin; anterior 
side very short; posterior side obscurely angular, truncated; dorsal margin 
sloped; ventral margin rounded, smooth within. (Conch. Iconica.) 
Type in British Museum? Type locality, northern seas. 
Range. Arctic and Bering Sea and the Aleutian Islands. Circum- 
boreal. 
Astarte borealis Schumacher, 1817. 
Essai, 47 :pl. 17, fig. 1. 
Shell compressed, with the beaks concentrically ribbed; the rest of the 
disk more or less smooth. 
This is the semisculata of Leach, 1819; the veneriformis Wood, 1828. 
(Dali.) 
Type locality and disposition of the type not known to the present 
writer. 
Range. Polar and Bering Seas to Prince William Sound, Alaska. 
Also North Japan. 
Astarte alaskensis Dali, 1903. 
Plate 13, fig. 20. 
Proc. U. S. N. M.y 26:944; pi. 63, fig. 2. 
Much resembling A . elliptica of the eastern coast, but shorter, heavier, 
and more triangular. The periostracum is black or dark brown and 
dehiscent when dry. It has usually been identified as undata but is never 
crenulated. (Dali.) 
Type in U. S. N. M. Type locality, southern part of Bering Sea. 
Range. Herschell Island, Arctic Coast; Southern Bering Sea, the 
Aleutians and south to Puget Sound. 
