308 Distribution of the Salmonide: 
tainty, and these are closely similar. One of them is found in Alaska 
and the other in Russia. Other species are said to ascend some 
Siberian rivers from the Arctic Ocean. I have compared a speci- 
men from the Volga with our Alaskan “inconnu,” and find theirsimi- 
larity very striking. They agree substantially in number of fin-rays 
and rows of scales; but the first appears to have several more rows 
above the lateral line than the other. 
Quinnat Salmon (Oncorhynchus ehouicha). Columbia River, Oregon. About $ 
natural length, 
The genus of Pacific salmons (Oncorhynchus) which is very closely 
related to Salmo, is represented by five species, all of which are more 
or less black-spotted, especially while sojourning in streams. They 
ascend the rivers falling into the North Pacific in Asia and North 
America. The distribution in Asia is incompletely known. All 
of the species have been certainly identified from Kamschatka. 0. 
gorbuscha, the little humpback salmon, extends farthest north, having 
been found in the Colville River in Alaska and ranging southward 
only to Oregon. The dog-salmon (O. keta) has been taken in the 
Kowak River, Alaska, and southward to California. The blue- 
back or red fish, O. nerka, extends northward at least to the Yukon 
and southward to the Columbia. Chouicha, the king or quinnat 
salmon, is known from the Ventura River, in California, to the 
Yukon, in Alaska. O. kisutch, the silver salmon, ranges from 
Francisco, probably, to the Yukon. The most northerly species, 
gorbuscha, is the smallest and least valuable. The only good char- 
acter which may be depended upon for distinguishing Oncorhynchus 
- from Salmo is its numerous rays in the anal fin. Í 
Salmo inhabits Great Britain and the Continent of Europe; # 
sends a representative into Africa; it is more or less represented 10 
