FIGURES 12S AND 129 



128 Same, section 10. 



129 Same, section U. 



3 Right prccaval vein. 



4 Atrophjdng embryonal vein, forming kernel in interior of developing 



and replacing lymphatic space. 



5 Extraintimal or perivenous lymphatic space surroundin^g degenerat- 



ing embryonal vein. 



7 Aorta. 



9 Trachea. 

 10 Pulmonary artery. 

 22 Vjxgus. 



