HYPOPHYSECTOMY AND EARLY DEVELOPMENT 



323 



RANA PIPIENS 



KlfP0PHY3EAL INVAQINATtON 



HYPOPHYSEAL 

 INVAGINATION 



STOMODEAL CLEFT 



HYPOPHYSEAL ANLAGE 



HYPOPHYSECTOMY 



CONTROL 



HYPOPHYSECTOMIZED 

 AT STAGE 18 



Tuberculum postenus 



Mesencephalon 



Epiphysis 



Neurocoei 



Proctodeum (onus) - 

 Yolk 



Hypophysis 

 Optic recess 

 " Heort Opttc chiosmo 



Pencardiol covity 



Liver diverticulum 



RECONSTRICTION OF THE 5 mm. TADPOLE 

 IN SAGITTAL SECTION 



