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PROCEEDINGS OF THE NATIONAL MUSEUM 



Table 4. — Measurements, in millimeters, of Chlamys islandica (Milller) collected 



at Point Barrow, Alaska 



(Key: L, living; Shi, empty shell) 



1 Among foliaceous bryozoans, and obviously grew in cramped quarters as the ventral edges were incurved 

 so that the height was shortened, although there was little or no erosion. 



2 Among foliaceous bryozoans, and obviously grew in cramped quarters as the ventral margin was eroded 

 and the ventral edges were incurved so that the height was shortened. 



3 This specimen has barnacles of four size groups growing on it (1 large, 6 medium, 6 or 7 small, and 

 numerous tiny individuals), also several tunicates, an encrusting bryozoan, aspecies of Barentsia, colonies 

 of hydroids, and several Hkitella arctica nestling around the barnacles. 



* Compare with one from 125 feet. 



« Convex at ventral margin. 



« Compare v/ith one from 522 feet. 



The inside of the valves of the Point Bo.rrow specimens tends to be 

 white with sometimes some reddish purple color in the central portion 

 showing through from the outside of the left valve, and occasion all}'' 

 with some of the same color around the edges. Shells examined from 

 Bergen are largely apricot colored on the inside of the left valve and 

 apricot and white on the inside of the light valve; a shell from Vads0 

 is apricot and purplish inside, and one from Fimnark is apricot with 

 a purplish muscle scar. 



Distribution: Jensen (1912) gives the range of this species as 

 Labrador, western Greenland, Iceland, Spitzbergen, Barents Sea, en- 

 trance to Kara Sea (1 small specimen) but not within the Kara Sea 

 (despite many dredgings), not in the Siberian Polar Sea nor Polar Sea 

 north of Arctic America nor in the High-Ai"ctic of eastern Greenland 

 but in the Bering Sea and one specimen from the coast of Korea and 

 one from the waters south of Vladivostok. In the Atlantic south to 

 Cape Cod and western Norway, 



The Point Barrow specimens extend the range into Arctic Alaska 

 and those mentioned above extend it into the Aleutians and the 

 Shumagins. 



