BULL. U. S. B. F. 1912. 



PLATE LXII. 



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Fio. 17. Wild brook trout from An Sable River; 8.2 cm. lonsr; cross section showing distribution of normal thyroid. X86. 



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Fie. 18. Algonquin wild brook trout; simple hyperplasia; high cuboidal epithelium reduction in some follicles and 

 absence in others of colloid. Distinct hyperaemia about follicles; increased amount of thyroid. X86. 



