

Figure 6 



a 



1, Precardinal vein 



2, Dorso-medial somatic tributary 



4, Mesenchyxnal blood-islands 



5, Dorso-lateral mesenchymal inter- 



Figure 7 



1, Precardinal vein 



2, Dorso-medial somatic tributary 



7, Brachio-cephalic venous anastomo- 

 sis 



cellular spaces, forming anlages 8, Dorso-lateral haemophoric lym- 

 of jugular lymphsac phatic plexus, haemophoric re- 



6, Medial mesenchymal intercellular cipient stage of jugular lymphsac 



spaces, forming anlages of brach- 

 io-cephalic venous anastomosis 



275 



THE AMERICAN JOURNAL OF ANATOMY, VOL. 16, NO. 3 



