1. sALMo. 13;} 



origin of the dorsal, is rather shorter than the head, and at least two- 

 thirds of the distance between its root and that of the ventral. 



The ventral is inserted below the two last dorsal rays, its length 

 being two-thirds of that of the pectoral, or of the distance between 

 the root of its outer ray and the vent. 



The scales are very thin and small ; one taken from between the 

 dorsal and the lateral Une is ovate, two-thirds as high as long. In 

 order to ascertain the number of transverse series of scales, it is ne- 

 cessary to count those above the lateral line, and not the perforated 

 scales of the lateral line, which are larger than the others and do 

 not correspond to the transverse series. The scales on the back are 

 minute, rudimentary, hidden in the skin. 



The colour on the sides of the back is a dark sea-green, passing 

 into blackish on the back, on the greater part of the dorsal, and 

 caudal. Sides with a slight silvery shade, passing into a beautiful 

 deep red on the belly. Pectoral greenish, passing into reddish pos- 

 teriorly, the upper margin being Avhite ; ventral red, with white 

 outer margin, anJ with a blackish shade within the margin ; anal 

 reddish, with a blackish shade over the whole of the middle, and 

 with white anterior margin ; sides of the head silvery, lower parts 

 minutely dotted with black. 



7. Salmo perisii. 

 Torgoch. 

 Torgoch, Willughby, Hist. Pise. p. 196 ; Farrin(/ton, Philos. Trans. 



1755, p. 210 ; Petm. Brit. Zool. lii. p. 267, or (edit. 1812) iii. p. 407, 

 Salmo salvelinus, Donov. Brit. Fish. pi. 112 ; Jenyns, Man. p. 428. 

 ? Salmo umbla, Je^iyns, Man. p. 427. 

 The Chan-, YarreU, Brit. Fish. 3rd edit. i. p. 241 (descr. part.) and fig. 



p. 245. 

 Salmo cambricus, Giinth. Proc. Zool. Sac. 1862, p. 49, pi. 6 (not Donov.). 

 Salmo perisii, Giinth. Ann. <^- Mag. Nat. Hist. 1865, xv. p. 75. 



D.13(14). A. 12(11). P. 12(13). V. 9. L. lat. 170. 

 Vert. 61. C«c. pyl. 36. 



Body slightly compressed and elongate, its greatest depth being 

 one-fifth or two-ninths of the distance of the snout from tlie root of 

 the caudal fin ; the length of the head is considerably more than one- 

 half of the distance between the snout and the vertical from the 

 origin of the dorsal. Head rather depressed ; interorbital space flat, 

 its width being less than twice the diameter of the eye. Males with 

 the lower jaw longest ; teeth of moderate strength. Uill-cover over- 

 lapping the root of the pectoral. The height of the dorsal fin two- 

 thirds of the length of the head. Length of the pectoral less than 

 that of the head, much more than one-half of the distance between 

 its root and that of the ventral. Sides with numerous red dots ; 

 belly red in the mature fish ; pectoral, ventral, and anal with white 

 margins. 



Lakes of North Wales. 



a. Several adult specimens : types of the species. Lakeof Llanberris. 

 Presented by T. P. W. EUis, Esq. 



