Bull. U. S. B. F. 191 2. 



Plate LXXXVI. 



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Fig. 72. — Massive thyroid tumors in wild Salmo sebaso 4 years old. caught in Sebago I,ake. Maine. I,argest fish 

 observed with tumors. Natural size. 



Fig. 73. — Smallest tumor fish, domesticated brook trout 5 months old. Natural size. 



