XIV.] 
SURVEY OF BEHRING’S STRAITS. 
243 
Pacific separates tlie Old World from the New. An elevation 
of the land less than that which has taken place since the 
g'lacial period at the well-known Chapel Hills at Uddevalla would 
evidently he sufficient to unite the two worlds with each other 
by a broad bridge, and a corresponding depression would have 
been enough to separate them if, as is probable, they were at 
one time continuous. The diagram shows besides that the 
deepest channel is quite close to the coast of the Chukch 
SHELL FROM BEHRING’S STRAITS. 
F^cs^ls deformis, Reeve. 
Peninsula, and that that channel contains a mass of cold water, 
which is separated by a ridge from the warmer water on the 
American side. 
If we examine a map of Siberia we shall find, as I have 
already pointed out, that its coasts at most places are straight, 
and are thus neither indented with deep fjords surrounded with 
high mountains like the west coast of Norway, nor protected 
by an archipelago of islands like the greater part of the coasts 
of Scandinavia and Ednland. Certain parts of the Chukch 
R 2 
