224 
T,AKE TROtJT. 
in tlie lower jaw, and within on each side near the front a short 
separate row. Tongue fleshy, with a double row of not -very 
large teeth. Being a male there was the kipper or turned-up 
process on the front of the lower jaw, but not so high as in 
the Salmon; and it was received into a cavity in the upper 
jaw. Nostrils above the level of the line from eye to snout; 
scales on the body round, those along the lateral line shining; 
origin of the dorsal fin one foot and an inch from the snout; 
adipose fin large, and not far from the tail; its upper part 
widest. Width of the tail eight inches, and at its root three 
inches and a fourth; the border might be called straight, except 
that there is a small point at the corner above and below; 
pectorals rather wide, the upper rays curved. The colour along 
the back and upper part of the sides dark, tinted with blue, 
as are also the dorsal fin and tail; cheeks yellow, covered, as 
is the body, very thickly with round dots; none on the belly; 
pectorals and ventrals yellowish; anal dark. A tinge of purple 
on the sides, where the scales shine as if pearly. The dark 
spots on the body are also spread over the dorsal fin and tail; 
and even on the lower portion of the transparent cornea (of 
the eye.) 
In an example from Malham Tarn of much less size, the 
muscular structure appeared more decided; the tail broader and 
more round; dorsal and anal fins more developed; a more 
decided tinge of yellow along the sides; the adipose fin reddish ; 
and the spots proportionally larger, with a warm tinge. 
In a comparison of several examples, Mr. Thompson found 
permanent differences between the sexes; the teeth being con- 
siderably stronger in the male; the distance from eye to snout 
greater; and the form of the operculum is different, that of the 
female approaching in roundness to that of the Salmon. In 
some instances the spots in the male have a pale circle of dull 
orange round them. 
I found the fin rays of the dorsal to be twelve, anal ten, 
pectoral thirteen, caudal twenty. 
