LAKE TROUT. 
23 
Descriptions of Salvelinus namaycush which served as Subjects of the Illustrations of this Species in 
the present Paper. 
Male . — Head long, 3.56 times in length without caudal; eye 6 in head; snout, 4; upper 
jaw, 1.87; lower jaw, 1.62. Body stout and heavy, strongly curved forward, the depth 4.03 in 
length without caudal; caudal peduncle slender, its least depth 1.17 in the distance from anal 
to lower base of caudal; dorsal rays 11, the fin inserted slightly nearer tip of snout than base of 
caudal, its height or longest ray about 2, and its length of base slightly over 2, in length of head; 
distance from tip of snout to base of pectoral, 1.09 and length of pectoral 1.71 in length of head; 
ventral length equaling height of dorsal, the distance of its base from base of pectoral equaling 
head, 3.56 in length without caudal; distance from ba.se of ventral to origin of anal about 1.5 
in distance from pectoral to ventral; base of anal 2.6 and its height 2.14 in head, distance from 
origin of anal to middle base of caudal about equaling length of head; anal rays 10; distance 
from tip of snout to ventral about equaling distance from ventral to fork of caudal. Caudal 
strongly forked, the shortest or middle rays about one third the length of the lower or longest 
ray. 
Coloration . — Above, dark grayish olive, fading downward toward middle longitudinal 
axis of body to paler color with pinkish bloom, becoming less green and changing to grayish 
pink on abdomen and lower part of body; almost white below. Sides of upper part of body 
with irregularly shaped yellowish-olive spots, growing smaller downward and disappearing along 
the side below lateral line; dorsal with dusky-margined lighter olive spots between the rays, the 
margins disappearing toward the tip of the fin; adipose darker than back with olive-green spots; 
caudal darker than back, gray green, lighter gray at tips, incompletely cross-barred with dusky 
(about eight bar.s), becoming less distinct as they approach the tips of the fin; small yellow spots 
on base; pectoral, ventral, and anal fins light dull reddish at tips, with faint dusky bar across the 
middle, fading to lighter color, dull yellowish white on bases; pectoral with six or eight small 
black spots on each ray. 
Head darker than body but of same colors, becoming paler on sides, with iridescent luster 
of yellow and pale pinkish; lower jaw light greenish gray, fading into whitish, with faint dusky 
shadings. Iris dull orange, clouded with dusky. 
Specimen, 15g inches long, from Thompson Pond, Oxford, Maine. 
Female . — Head long, 3.77 times in length without caudal; eye 5.6 in length of head; snout, 
4.3; upper jaw, 1.91; lower jaw, 1.78. 
Body stout, heavy, and strongly curv'ed dorsally forward; depth 4.26 in length without 
caudal; caudal peduncle slender, its least depth about 1.33 in the distance from posterior end 
of anal to lower base of caudal, and about 3.33 in the greatest depth of body; dorsal rays 11; 
the fin inserted somewhat nearer tip of snout than middle base of caudal, the longest ray 1.62 
