The Lymphatic System in Human Embryos. 



71 



V.u/d: 



Fig. 9. A composite diagram made by superimposing tlie sections stiowing 

 tlie jugular sacs, as shown in Figs. 16 and 17, of human embryo, 11 mm. 

 long. Mall collection. X about 36. D. C, ductus Cuvier ; V., position of 

 valve; V. j. i., vena jugularis interna; V. t. 1., vena thoracicus lateralis; 

 V. u. (p.) vena ulnaris (primitiva). 



