894 FISHES—SALMONIDA. 
Salmo confinis, DEKay, N. Y. Fauna Fish. 1842, 238 (Lakes of New York). 
Salmo symmetrica, Salmo pallidus, RAFINESQUE (Lake Champlain); Salmo adirondacus,. 
Norris (Adirondacks); Salmo toma, HAMDEN (Maine), etc. 
Var. siscowet. 
Salmo siscowet AGASSiZ, Lake Superior, 1850, 333. 
Description —Body elongate, covered with thin skin, there being no special develop- 
ment of fatty tissue under the skin; head very long, its upper surface flattened ; mouth 
very large, the maxillary extending much beyond the eye, the head and jaws propor- 
tionately lengthened and pointed; teeth very strong; caudal fin well forked; general 
coloration dark gray ; sometimes pale, often almost black; everywhere with rounded, 
paler spots, which are sometimes reddish tinged; head usualiy vermiculate; fins often 
mottled; dorsal and caudal reticulate with darker; eye large, 44 in head; maxillary 
nearly half the length of the head; interorbital space nearly 4; head 4; depth 4; D. 
11; A, 11; 1. 1. 185-205. Length 2 to 4 feet. Average weight about 4 pounds. Speci- 
mens of 50 to 80 pounds weight are sometimes taken. 
Habitat, Lake, Region and Lakes of Northern and Western New York, New Hamp- 
shire, and Maine to Montana and northward, very abundant in the larger bodies of water, 
varying somewhat in size, form, and color in the different lakes. 
Description of var. siscowet (Agassiz), Siscowet Salmon. 
Body short and deep, covered with thick skin, there being an excessive tendency to 
the development of fatty tissue ;- head very short and deep, its upper surface broad and 
short, covered by askin so thick as to completely hide the bones; no distinct median. 
carina; mouth very large, its gape narrower than in C. namaycush; teeth weaker than 
in C. namaycush, its supplemental bone also shorter and broader; maxillary a little more. 
than half the length of the head; caudal fin well forked ; scales small, about 175 in the 
lateral line; coloration as in C. namaycush, but usually paler; fin-rays the same. 
Habitat, Lake Superior; abundant, but not yet found elsewhere. This form is very 
close to the preceding, but differs in the shortness and breadth of the bones of the head 
and in the extreme fatness of the flesh. 3 7 
Diagnosis —The Lake Trout, when adult, may be readily known by its. 
large size and gray spots. The young much resembles the Brook Trout, 
and has equally small scales. It can always be distinguished (a) by the 
presence of teeth on the median line of the vomer, behind the front. 
patch, and (6) by the presence of a patch of distinct, stout teeth on the 
hyoid bone or root of the tongue. The Brook Trout has teeth on the 
front of the vomer only, and on the margin of the tongue. 
Habits —The wide range of this species and the great variety in the: 
waters which it inhabits, and the food on which it lives, render it more 
than usually subject to variations in size, color, and appearance. It is 
stated similar variations occur in its habits, but as I have seen the fish 
alive only in the Great Lakes, I have no means of verifying these state- 
ments. The following general account is condensed from Milner (Rept. 
U.S. Fish Commr., 1872-8, 38). 
