310 



GEO. S. HUNTINGTON 



■^'^r^ 









5 15 



20 B 



Figures 20 A and 20 B 



/, Aorta 4, Periaortic mesenchymal lymphatic 



2, Azygos veins . spaces 



S, Periaortic blood-islands 5, Temporary ventro-medial azygos 



tributary plexus 



