EXPLANATION OF PLATE III 



Fig.' 5. Photomicrograph of section of cephalic extremity of embryo kitten 

 about seventeen millimeters in length. 



I. Infundibulnm. 

 P. I. Processus infundibuli. 

 H. C. Hypophysis cerebri. 

 A. C. V. Anterior cerebral vesicle. 

 M. C. V. Middle cerebral vesicle. 

 P. C. V. Posterior cerebral vesicle. 

 Phar. Pharvnx. 

 Hg. 6. Photomicrograph of the region under consideration, from tlie same 

 section, enlarged. 



I. Infundibulum. 

 P. I. Processus infundibuli. 

 H. C. Hypophysis ceiebri. 



