442 Mr. W« Thompson's Notes on B?itish Char. 



up and hooked ; the head in this sex is very much larger in 

 every part than in the female, and the size of the tins is much 

 greater. 



The males, though differing in intensity of colour, may be 

 described as lilac-black or dusky, relieved by a lilac tinge on 

 the uppermost third of the body, viewed lengthwise, from the 

 dorsal ridge, becoming however gradually paler from this 

 part ; the middle of the sides is lilac-gray, beautifully and 

 somewhat closely marked with round scarlet spots about a 

 line in diameter ; the lowest portion of the sides is of a sal- 

 mon-coloured scarlet without spots. The head and the dorsal 

 fin are dusky, with a lilac tinge ; the pectorals dusky above, 

 tinged with scarlet beneath where they rest upon the part of 

 the body which is of this colour ; the ventrals are bright 

 scarlet, with occasionally a dusky longitudinal band inside 

 the margin, which is white ; the anal fin dusky, tinged with 

 scarlet — in all ; the ventrals and the anal fin have a white 

 margin, and some have the lower lobe of the caudal fin like- 

 wise of this colour: two or three individuals have a tinge 

 of red on the caudal fin. Donovan's description of the co- 

 lour of S, Salvelinus agrees admirably with the present spe- 

 cimens. 



The females in colour somewhat resemble Donovan's S. al- 

 pinus : the uppermost third of the body, viewed lengthwise, 

 from the dorsal ridge, is dusky, relieved by lilac, becoming 

 gradually paler downwards, so that the middle of the sides 

 presents a dull lilac — this part is adorned with numerous round 

 spots of similar size to those in the male, but less bright in 

 colour ; some however are scarlet, but they are chiefly either 

 pink, or of a dull chalky pinkish hue, as represented in Do- 

 novan's S. alpinus ; the lowest portion of the sides is of a 

 silvery lilac, without spots. The fins are all dusky, with a 

 tinge of lilac ; the margin of the ventrals, of the anal, and oc- 

 casionally of the caudal fin, is white, as in the males — there is 

 no regular spotting on the dorsal fins, as represented in Do- 

 novan's figures of his two species. The dorsal fins of the 

 males are nearly all blackish, occasionally towards the tip 

 transparent, which.those of the females generally are, and in 

 one or two individuals of the latter sex an approximation to 

 spots may be faintly traced. One only of the males and a 

 few of the females exhibit transverse markings along the sides 

 like the " Par," but not so conspicuously. On dissection, the 

 milt (of the ordinary white colour) and roe (of an amber* hue) 



* This is the general colour ; some are of a very pale yellow ; the ova of 

 both colours are of similar size. 



