.* sjy Dorsal 

 Dorsal '~W f "iM W& ~~'i^^h''''(i> I ^ mesocarcliurr 



St .'7- - '"'^'r'-'..- ; ~ 7\VJ< 



,--->' " ' ' 



C35> " Lip ot left valve of sinus venosus 



5inus venosus. 



Common pulmonary vein. 



Dorsal mesocardu 



* Lip ot left valve 

 J,:; of sinus venosus. 



Sinus venosus. 





Sinus venosus. 



Common pulmonary 

 vein 



/ Dorsal mesocardium. 



Dorsal mesocardium 



4 



