58 SALMONID.E. 



Several loughs in Ireland produce this fish, which some- 

 times attains the weight of ten or twelve pounds. The teeth 

 are remarkably small, but in number and situation like those 

 of iS. far io. 



The figure of the Trout at the head of this article, and 

 the following description, were taken from a Hampshire fish 

 of twelve inches in length. 



The length of the head compared to the length of the 

 head and body, not including the caudal rays, was as one 

 to four ; the depth of the body rather more than the length 

 of the head : the dorsal fin commenced half-way between 

 the point of the nose and the commencement of the upper 

 caudal rays ; the third ray of the dorsal fin, which is the 

 longest, longer than the base of the fin : the origin of the 

 adipose fin half-way between the commencement of the 

 dorsal fin and the end of the upper half of the tail ; 

 the pectoral fin two-thirds of the length of the head ; 

 the ventral fins under the middle of the dorsal fin, and 

 half-way between the origin of the pectoral fin and the 

 end of the base of the anal fin ; the anal fin begins 

 half-way between the origin of the ventral fin and the com- 

 mencement of the inferior caudal rays. The tail but slightly 

 forked, and growing slowly up to square in old fish, or even 

 very slightly convex, as seen in the figure of the large 

 Thames Trout. The fin-rays in number are 



D. 14 : P. 14 : V. 9 : A. 11 : C. 19. Vertebra 56. 



The form of the head blunt ; the eye large, placed one 

 diameter and a half from the end of the nose ; the irides 

 silvery, with a tinge of pink : the lower jaw in the Salmo- 

 nidfB appears to be the longest when the mouth is opened, 

 but it shuts within the upper jaw when the mouth is closed ; 

 the teeth numerous, strong, and curving inwards, extending 



