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



Plate LXXXI\- 



Fig. 67. — InfiltratiiiE thyroid tumors in the gill reRion of a wild white fish {CofriiouHs c/upri/o run's.) 



Fig. 68. — Microscopic section of the tumor shown in figure 66. Infiltration of wall of vein. Cell nests in hnnen. X136. 



