NORTHERN CHARR. 69 



genus. The peculiarities in the form and size of the parts 

 of the gill-cover are shown in the representation of the heads 

 of the two Charr introduced in the description of the next 

 fish : the branchiostegous rays vary from ten to twelve, and 

 frequently differ in number on the two sides of the head of 

 the same fish. 



The top of the head and all the upper parts of the back 

 umber brown ; the sides lighter ; the whole of the belly, 

 pectoral, ventral, and anal fins, deep reddish orange ; the 

 first ray of the ventral and anal fins white ; the sides above 

 and below the lateral line marked with numerous red spots ; 

 the irides orange ; gill-covers yellowish olive ; dorsal and 

 caudal fins dark brown, tinged with purple brown ; the lateral 

 line straight, but rising gradually from the parallel of the 

 point of the pectoral fin to the top of the operculum ; the 

 scales very small, more than thirty in an oblique line from 

 the base of the dorsal fin to the lateral line, and as many 

 from the ventral axillary scale upwards to the lateral line. 

 In this state as to colour, this fish is considered to be the 

 S. salvelinus of Continental authors. 



When not in fine condition as to colour, the top of the 

 head and along the back are pale purplish brown, becoming 

 lighter lower down ; the sides silvery ; the belly tinged with 

 pale orange ; above the lateral line are numerous small round 

 white spots ; irides and gill-covers silvery, with a tinge of 

 yellow ; pectoral, ventral, and anal fins, brownish red ; dorsal 

 fin brown ; caudal fin purple brown. 



In this state, as to colour, this fish is considered to be the 

 S. alpinus of Continental authors, Bloch excepted, whose 

 S. alpinuS) part iii. plate 104, appears to be a Trout. 



