FIGURES 118 AND 119 



118 Same, section 5. 



119 Same, section 6. 



3 Right precaval vein. 



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. 



7 Aorta. 



9 Trachea. 

 10 Pulmonary artery. 

 22 Vagus. 

 32 Ventral mediastinal venous plexus. 



