THE CHUKOTSK SEA 269 



Cardium calif orniensis, Serripes laperousii; the echinoderms : Solaster daw- 

 sonia arcticus, Asterias rathbwri anomala, Ophiura maculata, Gorgonocephalus 

 caryi typ. et f. stimpsoni, Echinaraclmius parma, Psoitis peronii, and others. 



The Chukotsk Sea fish fauna includes 37 species, distributed as shown in 

 Table 119. 



Table 119 



Seventy-five per cent of all the fish of the Chukotsk Sea consists of the five 

 first-mentioned families. High Arctic forms of the Arctic Ocean occur mainly 

 in waters adjacent to the western side of Wrangel Island and to the north of 

 it along the northern coast of Chukotsk almost up to the Bering Strait. The 

 Pacific Ocean forms are found in masses in the Bering Strait, penetrating the 

 Chukotsk Sea in two prongs : a northwestern one towards Herald Island and 

 a northeastern one along the shores of Alaska (Fig. 111). 



This distribution stands in complete agreement with the main currents of the 

 Chukotsk Sea (Fig. 111). 



In the northern part of the Chukotsk Sea, at the edge of the continental 

 shelf, Ushakov has found some typical Atlantic forms (Portlandia lenticula, 

 P.fratema), which, along with Atlantic waters, have penetrated the regions of 

 the Arctic basin so far removed from the Atlantic. 



