SALMON TRIBE. 
493 
The Salmon Tribe, —Family Salmon id jE. 
With the salmon tribe, which include the finest and “ gamest ” of all fresh-water 
fish, we come to the last group of the true bony fishes, which may be distinguished 
fiomthe preceding family by the margin of the upper jaw being formed by the pre- 
maxillse in front and by the maxillae at the sides. As a rule, the body is scaled, 
while the head is invariably naked; the under surface of the body being rounded. 
SALMON AND SEA-TROUT (J 11 at. size). 
Inhabiting alike salt and fresh-waters, those species which spend a part or the 
whole of their existence in rivers or lakes are in the main confined to the Temperate 
and Arctic zones of the Northern Hemisphere, although one outlying genus occurs 
in New Zealand; and whereas the majority of the marine forms are deep-sea 
fishes, two genera are entirely pelagic in their habits. A considerable number of 
the species inhabiting fresh waters descend periodically or occasionally to the sea; 
and in some cases it is perhaps rather difficult to say whether these fishes should 
be regarded as marine or fresh-water. All the salmonoids are remarkable for the 
