Bull. U. S. B. F. 1912. 
Plate L,XVI. 
Fig. 26. — Brook trout, showing massive thyroid tumor in the mouth cavity, springing from the floor of the mouth. 
Fig. 27. — Two year old brook trout, showing massive tumor filling the entire gill space. 
Fig. 28. — Brook trout, showing tumor mass at the tip of the lower jaw. 
