FIGURES lie. AND 117 



110 Same, section 41. X 225. 



117 Transverse section through veulial j)ait of upper tiioracic- region in a 14 

 inm. cat oinbryo (series 212. slide X. section 41. X 225. 



3 liight jirecaval vein. 



4 Atrophying embryonal \'eiii. I'onning kernel in iiiierior of ile\-elo|)ing 



and replacing lymphatic space. 



5 ]']xtraintinial or perivenous lyin))li;it ic s])ai'e siiiTouiiding degeiiei-at- 



ing embryonal vein. 



7 Aorta. 



9 Trachea. 

 10 Pulmonary artery. 

 22 Vagus. 

 32 Ventr:il ni ■(li.'isi in;il \'enoiis p](.'\us. 



