FIGURES 226 TO 229 



226 Same, section 2. 



227 Same, section 3. 



228 Same, section 4. 



229 Same, section 5. 



4 Atrophying embryonal vein, forming kernel in interior of developing 



and replacing lymphatic space. 



5 Extraintimal or perivenous lymphatic space surrounding degenerating 



embrvonal vein. 



