PLATE 6 



EXPLANATION OP PIGUEES 



24 A diagram of the ventral view of the brain of a 45/6.0 frog tadpole to show 

 the position of the hypophysis. 



25 A model of the infundibular process and hypophysial components of a 38/3.5 

 normal frog tadpole (specimen 15), fixed 63 days after the operative stage. Liver 

 diet. The caudal end of the infundibular process faces the top of the page, a, 

 dorsal, 6, ventral, c, median sagittal, views. X89. 



124 



