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



PLATE LVI. 



Fie;. 1. From Scott's "Cancer in Fish." 1891. Floor of mouth of Sa/mo fontinal is, showing protrusion of tumor in 

 pharyngeal floor. 



FIG. 2. Drawing from microscopic section showing acini with infiltration of surrounding structure of individual 

 cells. After Scott. 



