17 



tongue, their absence occurring in botli crosses and in speci- 

 mens five and six years old, although it is more common in 

 yearlings. 



The peduncle of the tail is one-third of the length of the 

 head. The first dorsal fin is somewhat in advance of the 

 middle of the total length, its anterior two-thirds being in 

 front of the belly fins. The base of the first dorsal is nearly 

 as long as its longest ray. The anal fin is very long; its 

 longest ray is much longer than the length of its base and 

 somewhat larger than the longest ray of the dorsal fin. The 

 short and stout adipose dorsal fin is placed over the end of 

 the anal. The belly fin reaches almost or quite to the vent, 

 when laid backward. Its appendage is one-third to two-fifths 

 as long as the fin. The breast fin is about three-fourths as 

 long as the head. A six year old hybrid, produced by fertilizing 

 saibling eggs with milt of Salmo fario, has the breast fin of 

 the right side produced into a long tip, three fifths of an inch 

 longer than its fellow of the opposite side. There are 142 

 scales in the lateral line, of which 122 are tube- bearing. 

 There are 14 rows of scales from the end of the anal fin obli- 

 quely upward and backward to the lateral line ; 16 rows from 

 the end of the adipose fin obliquely downward and backward 

 to the lateral line ; 23 rows from the end of the dorsal obli- 

 quely downward and backward to the lateral line. 



The branchiostegal membrane is supported bv 12 rays. 

 The dorsal fin has 10 divided rays ; the anal 8 ; the breast fin 

 12, and the belly fin 8. The number of gill-rakers is 21, of 

 which 13 are below the angle; the longest raker is nearly 

 one-half as long as the eye. There are 58 pyloric coeca in 

 one individual, and 60 in another example crossed the op- 

 posite way, that is, by fertilizing saibling eggs with milt of the 

 Salmo fario. The latter trout has 42 coeca and the saibling 

 has 42 to 45 in specimens examined. 



The general color is vandyke brown, the lower parts lighter. 

 The sides are profusely vermiculated with narrow, pale mark- 

 ings and with small blotches of the same color, the vermicula- 



