336 University of California Publications in Zoology. |Vou.9 
the precipitation is but a third as much or less. This marked 
antipathy to the Sound is well shown by the failure of almost 
all the species of large game-mammals of the Kenai Peninsula 
to oceur even sporadically in this region. These species are 
confined to the comparatively dry interior and west slopes of 
the Peninsula and range only as far east as the summit of the 
western divide. 
The scanty mammalian fauna which oceurs is very uniformly 
distributed on the mainland and those islands separated from 
it by shallow channels. On the more isolated central islands 
several of these species are lacking, and, moreover, this group, 
comprising Montague, Green, Knight, Dise, Eleanor, Naked, and 
their adjacent islets, agree in a measure in their mammalian 
fauna. According to the soundings given on recent maps, this 
eroup of islands is separated from the mainland and other isl- 
ands by depths of 100 fathoms or more and from each other by 
channels of less than 90 fathoms in depth. Its islands all lack 
Evotomys dawsoni (except on Knight Island) and Sorex perso- 
natus streatori, both of which are generally distributed on the 
other islands and on the mainland. Montague Island, the larg- 
est and most isolated of the group, is the only island of the Sound 
which shows any appreciable amount of faunal individuality. 
The Microtus (M. elymocetes) of this island is a well-marked 
form. 
It is remarkable in view of the great abundance of Erethizon 
everywhere on the mainland that this mammal has not made 
its way to any of the islands. Apparently it is a very recent 
arrival in the region. Other comparatively recent immigrants 
are: NSciurus hudsonicus petulans, Synaptomys dalli, Evotomys 
dawsoni, and Sorex personatus streatori. 
It is now quite impossible to determine what .species of 
mammals oecurred on the islands that have been used as fox 
farms for any considerable time. Storey Island, which first 
fell a victim to the foxes and has been farmed longer than any 
other, is now without trace of any terrestrial species of rodents 
or insectivores. The only island now used as a fox farm is 
Perry. The manager of this farm, who is a trustworthy ob- 
server, assured me that his foxes had lone since exterminated 
