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



Platk LVII. 



Fig. 3. — Rainbow trout. Redrawn from tiilruths colored onEinal. 19(I2. Large tumor on eacli side of brancliial 

 junction. Gill fringe distended on surface of lower one. 



Fit;. 4a. — Yenrlinp liybrid salmon. Massive tumors and marked emaciation. l,ot 19SSa. 



Fk;. 4b. — Two year old Sa/mo Sf^fiago, extreme emaciation. I,ot 1950. 



Fig. 4. — Sii/ino ffin(ina/is 2 years old. First external evidence of tumor in base of muscular structure of isthmus. 

 showiiiE marked infiltrative tendency of growth. 



