SALMO NIGRIPINNIS. 285 



It differs from Salmo trutta, in having a higher body, more deeply 

 emarginate caudal fin, stronger maxillary bone, and smaller eye. There are 

 fifty-nine to sixty vertebrae, and fifty -nine to sixty -two pyloric appendages. It 

 is probably a variety of S. mistops, and in fin formula and scaling resembles 

 S. nigripinnis. 



Salmo mistops ((TUNTIIER). 



D. 14, A. 12, P. 14, V. 9. Scales : lat, line 118, trans. 2634. 



This is a migratory Trout, found in the Eidfjord River, in Norway, which 

 Dr. Giinther regards as closely allied to Salmo gallivensis. Its eye is 

 extremely small, being from one-eighth to one-seventh of the length of the 

 head, and, in harmony with the small size of the eye, the frontal region is 

 convex above, and the snout pointed. The maxillary bone is long, narrow, and 

 weak. The vomerine teeth are in a single series, and gradually disappear, the 

 vomer being toothless in fishes seventeen inches long. The pre-operculum has 

 the posterior margin, the angle, and well-developed lower limb rounded. The 

 tail is rather broad, and covered with rounded scales, which are a little larger 

 than those on the back. The back is greenish, but the general colour is silvery, 

 with black X -shaped spots on the sides, round black spots on the operculum 

 and head, and a few black spots on the dorsal fin. It has fifty-nine to sixty 

 vertebrae ; and forty-three to fifty-two plyloric appendages. 



The young loses its Parr marks before it is nine inches long. 



The Scandinavian Trout are all closely allied. 



Salmo nigripinnis (GUNTHER). 



D. 14, A. 12, P. 13, V. 9. Scales : lat. line 120125, transverse 2830. 



A Trout is found in the mountain pools of Merionethshire and other 

 localities in Wales, and Lough Melvin in Ireland, which reaches a length of 

 sixteen inches. The female is mature at a length of seven inches. 



The upper part of the body is dark, with a greenish or reddish colour, occa- 

 sionally blackish. The sides and belly are greyish, though each scale, like 

 those of the back, usually has a silvery centre. The spotting of the sides 

 varies ; sometimes there are numerous black ocelli, with a whitish rim, some- 

 times a few rounded reticulated black spots on the sides, with a series of red 

 ones on the lateral line. The dorsal fin commonly has rounded black spots, 

 but all the fins are dark, and in the young fish dorsal, ventral, and anal have 

 a black and white outer margin. The depth of the body slightly exceeds the 



