Fig. 17 Transverse sectidii of the same einbryci at level indicated in pre 

 ceding figure, to show the eonniumication between the lunbilieal and innplinld 

 mesenteric veins. Slide 4, row 4, section 6, X 300, Reduced J. 



1 Aorta 



'2 Dorsal s<'gmental arlcrv 



3 Omphalomesenlcrii; vein 



4 Umbilical vein 



5 Juxta-neural vessel 



6 Somite 4 



7 Coelom 



S Section of vessel of i 



irdiiial posil ion 



72 



