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



Plate LXVII. 



Fk;. 29. — Brook trout sliowinH" nodular growths in Fk;. 30. — Brook trout sliowinir iiuituTOus tumor veye- 



fioor of mouth. tations in floor of mouth. 



Fig. 31. — Section of floor of mouth sliowiuk' thyroiii follicles Krowin^ in tpitlielium above basal menibniue. X7l). 



