An Analysis of the Jnxta-Neural Epithelial Portion etc. 293 



Fig. 45. Projection drawing of a transverse section from a 51 mm cat embryo show- 

 ing the relation of the tuberai sprouts and the body of the buccal sac 

 to the diencephalon. — 9, eminentia saccularis; 17, recessus tuberis; 

 25b, body of buccal sac; 30, tuberai process (anläge of pars tube- 

 ralis). 



Fig. 46. Projection drawing of a transverse section of a 100mm cat fetus showing 

 the relation of the tuberai sprouts and the body of the buccal sac to 

 the diencephalon. 



In this stage the tuberai processes have. fused across the median line 

 and the pars tuberalis thus formed has displaced the body of the buccal 

 sac ventrad away from its original juxta- neural portion. — 9, eminentia 

 saccularis; 17, recessus tuberis ; 25b, body of buccal sac; 30, tuberai process 

 (anläge of pars tuberalis). 



Fig. 47. Projection drawing of a transverse section from a chick of 5 days and 

 20 hours, showing the relation of the buccal sac to the diencephalon 

 and the presence of the tuberai processes (anläge of pars tuberalis). 

 — 25b, body of buccal sac; 27, floor of diencephalon; 30, tuberai 

 process. 



Fig. 48. Projection drawing of a transverse section from a chick of 6 days and 

 22 hours showing the relation of the buccal sac to the diencephalon and 

 the presence of the tuberai sprouts. — 25b, body of buccal sac; 27, floor 

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



Fig. 49. Projection drawing of a transverse section from a chick of 16 days 

 showingthe fusion of the tuberai processes across the median line form- 

 ing the pars tuberalis, with the consequent ventral displacement of the 

 body of the buccal sac away from its original juxta -neural position. — 

 9, eminentia saccularis; 12, pars tuberalis; 14, pars distalis; 17, recessus 

 tuberis. 



References. 



1. Herring, P. T., 1903. The Histological Appearances of the Mammalian Pitu- 



itary Body." Quarterly Jour, of Exp. Physiol., Vol. I, page 121. 



2. Herring, P. T., 1908. The Development of the Mammalian Pituitary and its 



Morphological Significance. Quarterly Jour, of Exp, Physiol., Vol. I, 

 page 161. 



3. P rath er. 1900. The early stages in the development of the Hypophysis of 



Amia Calva. Biological Bull., Boston, Vol. I, Nr. 2, page 57. 



4. Retzius. 1896. Das Menschenhirn. Stockholm. 



