FIGURES 114 AND 115 



114 Same, section 39, X 225. 



115 Same, section 40, X 225. 



4 Atrophying embryonal vein, forming kernel in interior of developing 



and replacing lymphatic space. 



5 Extraintimal or perivenous lymphatic space surrounding degenerat- 



ing embryonal vein. 

 10 Pulmonary artery. 



