THE ANATOMY OF THE THYROID GLAND 



201 



Fig. 15. Section of the thyroid gland of Raia showing the colloid within a 

 follicle disintegrated into spheroidal masses of varying size and depth of stain. 



flBC 



^-fol. thyr. 



Fig. 16. Section through the ventral margin of the thyroid gland of Mustelus 

 with sections of the very broad venae lymphaticae of the thyroid sinus simulating 

 an endothelial capsule about the gland. 



