FIGURES 110 -VXD UlA 



110 Transverse section through ventral i)art of upper thoracic region in a 13.5 

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



lllA Left part of section 30 of same embryo, sliown in tiie following figure 

 111, X 300. 



i Atrophying embryonal vein, forming kernel in interior of developing 



and replacing lymphatic space. 

 5 Extrainthnal orpcrivenous lymphatic space surrounding degenerating 



embrvonal vein. 



