432 



INTKODUCTION TO CRANIATA 



[CH. 



The development of the liver has exercised a profound influence 

 on the afferent part of the blood system corresponding to the 

 hinder part of the subintestinal vein of Amphioxus. The vast 



External Carotfd 



Afferent 



branchial 5 



FIG. 213. Diagram of the ventral and dorsal aortas and their branches in 

 Scy Ilium x about 1. 



