1. SALMO. 21 



Description of a young Male Salmon (Parr) from the Knkler {a rocky 



mountain-stream joining the liiver Tyne, in Northumberland) 



vnth the testicles fully developed, 6|- inches long, 



inches. 



Total length 6 1 



Greatest depth of the body l-X 



Length of the head 1|- 



Girth of the biggest part of the body 3i 



Least depth of the tail yt. 



Girth of the narrowest part of the tail \-\ 



Distance between the end of the snout and the eye . . | 



Length of the maxillary bone -|JL 



Distance between the eye and the angle of the praj- 



operculum |. 



Greatest width of the operculum | 



Grcatest depth of the operculum i 



Distance between the occiput and the origin of the 



dorsal fin ll 



Distance between the end of the dorsal and the root of 



the caudal fin 2JL 



Length of the base of the dorsal .' ^ 



Greatest height of the dorsal 1 



Length of the pectoral li 



Distance between the root of the pectoral and the root 



of the ventral 1| 



Length of the ventral fin 1 



Distance between the root of the ventral and the origin 



of the anal 1 



Length of the anal ^ 



Greatest depth of the anal ^ 



Length of the longest caudal ray 1 J^ 



Length of the middle caudal ray ^ 



The greatest depth of the body is below the origin of the dorsal 

 fin, and contained thrice and two-thirds in the total length (without 

 caudal), the length of the head being one-fourth of it. The snout 

 is obtuse, not longer than the diameter of the eye, which is one- 

 fourth of the length of the head ; the dentigcrous margin of the 

 intermaxillary bones is on the same level with the lower margin of 

 the orbit ; the lower jaw has no trace of a hook, is obtusely rounded 

 in front, and received within the upper jaw; the maxillary bone is 

 longer than the snout, dilated behind as in a river-trout, the width 

 of its broadest portion being one-half of the diameter of the eye ; it 

 extends backwards to below the middle of the orbit. The dentition 

 is perfect, and there is the same relative difference in the size of 

 the teeth as in adult specimens ; the teeth of the intermaxillary 

 bones form a curved, uninterrupted, transverse series ; those on the 

 vomer arc small, in a single series, extending further backwards 

 than the palatine teeth, the teeth being alternately bent towards the 



