An Analysis of the Juxta-Nenral Epithelial Portion etc. 291 



Plate XII. 



Fig. 15. Pieconstrnction showing the relation of the hypophysis in the adult fowl 

 to the diencephalon (in sagittal view). — 1, third ventricle; 3, optic 

 chiasm; 5, corpora mammillaria ; 6, area premammillaris; 8, recessus 

 infundibuli ; 9a, ventro - cephalic surface of eminentia saccularis ; 9b, caudal 

 surface of eminentia saccularis; 10, infundibulum ; 11, processus infundi- 

 buli; 12, pars tuberalis ; 13, pars infundibularis ;' 14, pars distalis ; 15, lumen 

 residuale; 17, recessus tuberis. 



Fig. 16. Reconstruction showing the relations of the hypophysis in the adult fowl 

 to the diencephalon (in lateral view). — 3, optic chiasm; 5, corpora 

 mammillaria; 11, processus infundibuli; 12, pars tuberalis ; 13, pars infundi- 

 bularis; 14, pars distalis; 24, lateral wall of third ventricle. 



Plate XIII. 



Fig. 17. Reconstruction showing the relation of the hypophysis in a 7 mm cat 

 embryo. — 25, Rathke's Pocket; 26, oral cavity; 27, floor of diencephalon; 

 28, infundibular process; 29, optic recess. 



Fig. 18. Reconstruction showing the relations of the hypopysis in a 10 mm cat 

 embryo, — 20, roof of mouth; 25, Rathke's Pocket (buccal evagination) ; 

 27, floor of diencephalon; 28, infundibular process; 29, optic recess. 



Fig. 19. Reconstruction showing the relations of the hypophysis in a 14mm cat 

 embryo. — 19, hypophyseal stalk; 25a, caudal projection of buccal sac; 

 25b, body of buccal sac; 25c, neck of buccal sac; 27, floor of dience- 

 phalon; 28, infundibular process; 30, tuberai process (anläge of pars 

 tubera.lis). 



Plate XIV. 



Fig. 20. Reconstruction showing the relations of the hypophysis in a 25mm cat 

 embryo — 19, hypophyseal stalk; 25a, caudal projection of buccal sac; 

 25b, body of buccal sac; 25c, neck of buccal sac; 27, floor of dience- 

 phalon; 28, infundibular process; 30, tuberai process (anläge of pars 

 tuberalis). 



Fig. 21. Reconstruction showing the relations of the hypophisis in a 31mm cat 

 embryo. — 19, hypophyseal stalk; 25b, body of buccal sac; 25c, neck 

 of buccal sac; 27, floor of diencephalon; 28, infundibular process; 30, tuberai 

 process (anläge of pars tuberalis). 



Fig. 22. Reconstruction showing the relations of the hypophyhis in a 51mm cat 

 embryo. — 14, pars distalis; 19, hypophyseal stalk; 27, floor of dience- 

 phalon ; 30, tuberai process (anläge of pars tuberalis). 



Plate XV. 

 Fig. 23. Recon.struction showing the relations of the hypophysis of the chick of 

 4 days. — 25, Rathke's Pocket; 26, oral cavity; 27, floor of diencephalon; 

 31, Seessel's diverticulum. 

 Fig. 24. Reconstruction showing the relations of the hypophysis of chick of 5 days 

 and 20 hours. — 19, hypophyseal stalk; 25, Rathke's Pocket; 26, oral 

 cavity; 27, floor of diencephalon; 30, tuberai process (anläge of pars 

 tuberalis); 31, .Seessel's diverticulum. 



19* 



