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



Plate LX. 



Fig. U. — Scotch ■seii trout. Longitudiiiiil ^t:>.u..H ..I i...ni .1,1.1 -....viiit; iionnal tti.vroid follicle."; : below, in 



the right hand comer, nn isolated misplaced th.vroid follicle biiig adjacent to the epithelium of the pit. xlu. 



