106 



SALMONID.K 



surface of the stomach presented an indurated cuticle, but the 

 parietes were not thicker than those of other Trout ; the 

 cavity was filled with some dozens of the Paludina impura of 

 Lamarck, The fin-rays and vertebrae were 



D. 12 : P. 14 : V. 9 : A. 11 : C. 19. Vertebra 56. 



So little difference appeared to exist between this and 

 English specimens of S.fario, as to induce the belief that 

 the Gillaroo is only a variety of the Common Trout, as 

 stated by Pennant. 



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 S. fario. 



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 pec- 

 toral 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 

 commencement 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. 



