FIGURES 110 AND 111A 



110 Transverse section through ventral part of upper thoracic region in a 13.5 

 mm. cat embryo (series 189, slide VIII, section 35) , X 225. 



111 A Left part of section 36 of same embryo, shown in the following figure 

 111. X300. 



4 Atrophying embryonal vein, forming kernel in interior of developing 



and replacing lymphatic space. 



5 Extraintimal orperivenous lymphatic space surrounding degenerating 



embryonal vein. 



