rHE r ROUTS 



The head is blunt and somewhat large, and is a 

 little more than one-fourth the length of the body. 

 It has a large mouth with teeth on the jaws, 

 tongue and palate bones, and a small patch on the 

 roof of the mouth. 



The scales are numerous and very small, almost 

 microscopical. The tail is nearly square in the 

 adult, and somewhat forked in the young. The 

 brook trout may be distinguished from the other 

 charrs by the dark brown or blackish markings 

 on the back, which are called " vermiculations " 

 or " worm-like markings." 



The Dublin Pond trout, Sahelinus fontinalis agas- 

 siziiy has as yet been found only in the water of that 

 name, sometime known as Monadnock Lake, and 

 in Centre Pond, both being in New Hampshire. 

 It is of a pale grayish coloration, the red spots 

 being very faint ; otherwise it is similar to Saheli- 

 nus fontinalis. 



The long-finned charr [Sahelinus alpinus altpes^ 

 and the Greenland charr [Sahelinus alpinus stagnalis) 

 are found only in the lakes of Greenland and of 

 Boothia Felix, but are supposed to exist in other 

 waters of Arctic America. The first takes its name 

 from the extraordinary length of its rayed fins, and 

 is otherwise distinguished by its forked tail and its 

 very small adipose or rayless fin. Of the Green- 



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