Bull. U. S. B. F. 1912. 



Platk LXII 



Fk;. 17. — Wild l»rook trout from An Snble Kiver: S.2 cm. loiiy:; cross section showing distribution of nornutl th.\n>i(l XSfi. 







r.. 18. — AlKonquin wild brook trout: simple hyperplasia: high cuboidal epithelium n ,!n 

 in others of colloid. Distinct hypericmia about follicles: increa.sed amount ul thi ruid. 



Kic. -_. --. 

 absence in others 



tion in some follicles and 



XS6. 



