84 



TEXT-BOOK OF EMBRYOLOGY. 



*" 



Prim, pericard. 



cavity 



Anlage / 

 of heart * 



Tail fold 

 of amnion 



Telencephalon 

 Diencephalon 

 Mesencephalon 



Metencephalon 

 Myelencephalon 



Peripheral limit 

 of coelom 



IK 



FIG. 80. Dorsal view of dog embryo with ten pairs of primitive segments. Bonnet, 



Prim. Intermed 

 seg. cell mass 



Parietal and 

 visceral mesoderm 



Ectoderm 

 (epidermis) 



Chordal Prim, 

 plate aorta 



Ccelom Entoderm Blood vessels 

 81. Transverse section of dog embryo with ten pairs of primitive segments. Bonnet. 



