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



PLATE LXXXIV. 



FIG. 67. Infiltrating thyroid tumors in the gill region of a wild white fish (Coregonus c/ufaeiforniis.) 



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FIG. 68. Microscopic section of the tumor shown in figure 66. Infiltration of wall of vein. Cell nests in lumen. X136. 



