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



PLATE LXVII. 



FIG. 29. Brook trout showing nodular growths in FIG. 30. Brook trout showing numerous tumor vege- 



floor of mouth. tations in floor of mouth. 



FIG. 31. .Section of floor of mouth showing thyroid follicles growing in epithelium above basal membrane. X70. 



'* % ri ', ' * "jfttffjT'^Tn' J 1 r*' ' I ' "<4e ! ' t ^>^*la' &&***' " ' 



:^ 



FIG. 32. Section from floor of mouth showing histological structure of papillary growths found in floor of mouth 



illustrated macroscopically by figure 30. X94. 



