FKJURES 13S AND 139 



138 Same, section 22. 



139 Same, section 23. 



3 Hisilit nrecaval vein. 



4 .\trophying embiyonal vein, forming kernel in interior of developing 



and replacing lymphatic space. 



5 Extraintirnal or perivenous lymphatic space surroiimlino, degen- 



erating embryonal vein, 

 (i Precardinal or precava of left side. 

 7 .\orta. 

 9 Trachea. 

 10 Pulmonary artery. 

 ■ 22 Vagus. 



