TEXT-BOOK OF EMBRYOLOGY. 



Prim, pericard. 

 cavity 

 Anlage 

 of heart 



Telencephalon 

 Diencephalon 

 Mesencephalon 



^telencephalon 

 Myelencephalon 



Peripheral limit 

 of ccelom 



Fig. So. — Dorsal view of dog embryo with ten pairs of primitive segments. Bonnet. 



Prim. Intermed. 

 seg. cell mass 



Parietal and 



Chordal 

 plate 



Ccelom Entoderm Blood vessels 

 FiG. 8i. — Transverse section of dog embryo with ten pairs of primitive segments. Bonnet. 



