DEVELOPMENT LYMPHATIC SYSTEM IN AMNIOTES 



307 











.^®<^:' 



-.-^2 



If 



® i* G> 



^.^ ^ .^ ® 



L , - <P Q <2> 



w^^ii^ -^,_ 



1, Aorta 



2, Periaortic blood islands 



19 B 



Figures 19 A and 19 B 



S, Periaortic mesenchyma] lymphatic- 

 spaces, the anlages of the tho- 

 racic ducts 



THE AMERICAN JOURNAL OF ANATOMY, VOL. 16, NO. 3 



