v.vert. ant. 
Ds 
§ cor lym.ant. sin. {§§ lym. tat. 
0) en" a 
yes rm : .¢@ 
” 
. 
Fig. 25 Photomicrograph of a transverse section through the left anterior 
lymph heart region in a 10-mm. embryo of Bufo vulgaris (IX. E. C., series B 34, 
slide 2, section 68). X 340. *, formation of the valve at the efferent portal. 
* Other references as before. 
Fig. 26 Same, in a 12-mm. embryo of Bufo vulgaris (K. E. C., series B 11, 
slide 3, section 41). X 340. *, valve of the efferent portal. Other references 
as before. 
106 
