Growth and Development of the Salmonidce. 169 



net and drafted into two well-marked varieties ; 

 and probably one of these could be again 

 divided into two kinds, although, until further 

 developed, it is difficult to do so with 

 certainty. 



The largest variety is a gray-coloured trout, 

 with no red spots, excepting one faint row 

 along the lateral line. These fish have made 

 much more rapid growth than the others of 

 the same age. The largest specimen measured 

 eight inches and a quarter, and the smallest 

 five inches and a quarter. The parr-marks 

 were slightly distinguishable only in the smaller 

 specimens. The pectoral, ventral, and anal 

 fins were yellow ; the dorsal had three rows of 

 black spots, the caudal had a black margin, 

 and the adipose fin was of a pink colour on 

 the tip. A specimen sent to Professor McCoy 

 was pronounced by him to belong to Salmo 

 trutta. The fin rays are — 



D., 12; A., 10; P., 13; pyl. esc, 63. 

 There are 14 rows of scales from behind the 

 adipose fin forward to the lateral line, and 25 

 rows above the lateral line. None of these 

 fish had, up to the end of 1878, commenced to 

 put on their silvery coat. 



