FIGURES 248 TO 251 



Same, section 19. 

 Same, section 20. 

 Same, section 21. 

 Same, section 22. 



4 Atrophying embryonal vein, forming kernel in interior of develop- 



ing and replacing lymphatic space. 



5 Extraintimal or perivenous lymphatic space surrounding degen- 



erating embryonal vein. 



