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Fig. 211. Diagrams to show the Development of the Atnnion and 

 Allantois. (After Foster and Balfour. ) 



In A the folds of the amnion (at) are to be seen rising up on either end of the 

 embryo (e) ; in B they have nearly met, and in c they have entirely coalesced. 

 In D the allantois (0 is seen making its way out of the body of the embryo, 

 and in E it is seen at a later stage. In v the yolk sac is shown in position, 

 and in G just before its final absorption. 



