Bull. U. S. B. F. 19(2. 
Plate LXXXI\'. 
Fig. 67. — Inriltratinff thyroid tiinior.s in tlie gill region of a wild white fish {Cofrg-o/ifn chipi'if<)rnii^.') 
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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. 
