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



Plate LXXXVI. 



Fig. 72. — Massive thyroid tinnnr-; ui \vil(i Sa/tuo scdasc" 4 years old. catigrht in Sebago hake. Maine. l,argest fish 

 obsen-ed with tumors. Natural size. 



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



