542 



THE FUR SEALS Of THE PEIBILOF ISLANDS 



The characteristic marine forms of the fauna are Ghitonidae, limpets and Bucci'- 

 nidae, of which several highly characteristic forms occur. I have added the giant 

 squid, Onyohoteuthis, as 1 have heard that specimens have been ca^t ashore at St. 

 Paul, though no naturalist has seen them. Occurring as they do at Unalaska, it 

 would be strange if they did not also extend their range to the Pribilof group. A few 

 species have so far been found only in this locality, but there is no reason to suppose 

 that they are actually restricted to it. Such are Chrysodomus insularis, tHromheUa 

 fragilis, and Beringius frielei, of the plateau fauna; and Strombella callorhina and 

 Biiccinum fischerianum, of the shore fauna. St. Paul seems to be the source of nearly 

 all the specimens of Strombella beringi Midd., which have hitherto been collected. 

 Altogether 86 forms are kuown from the group, of which 66 have been collected on 

 St. Paul and 42 on St. George; 17 are common to California, 72 to the Aleutian 

 Islands, 42 to the Arctic fauna, 31 to Kamchatka, and 10 to the northern islands of 

 Japan. All of the latter are common to the American shores, so it can not be said 

 that there is any characteristically Asiatic element in the fauna. 



For comparison, I have added a similar list of the species of the Commander 

 Islands, in which we have a squid, one land shell, one fresh- water shell, and one chiton, 

 which are known elsewhere only on the Asiatic coasts, a proportion out of 74 species 

 which can not be said to be large. Besides the mollusks an ascidian, Boltenia beringi, 

 was described by me from St. George, and a brachiopod, Bhynchonella {Hemithyris) 

 psittacea, is abundant at times on the beaches of St. Paul Island. 



Pribilof Islands, Bering Sea. 

 FAUNAL SUMMARY. 



