~ \ym., 
gs 
tee “lym.com.ju - et. lat. 
Fig. 21 Photomicrograph of a transverse section through the left anterior 
lymph heart region in a 10-mm. embryo of Bufo vulgaris (K. E. C., series B 34, 
slide 2, section 83). > 340. *, the common segment of the jugular and lateral 
lymphatics has indented the dorsal wall of the lymph heart, which has become 
thickened at this point. Other references as before. 
Fig. 22 Same, in a 12-mm. embryo of Bufo vulgaris (Kk. E. C., series B 11, 
slide 3, section 34). X 340. *, the wall between the lymph duct and the lymph 
heart has broken through in the middle and the two flaps so formed represent the 
valves of the afferent portal. Other references as before. 
101 
