Development of the Third Day 221 



11. The formation of the fore-gut and 

 hind-gut ; and the separation of the former 

 into oesophagus, stomach, and duodenum, and 

 of the latter into large intestine and cloaca. 



12. The formation of the lungs as diver- 

 ticula from the oesophagus just anterior to 

 where it enlarges to form the stomach. 



13. The formation of the liver and pan- 

 creas as diverticula from the duodenum, just 

 posterior to the stomach. 



14. Formation of the muscle plates; and 

 other mesoblastic changes. 



15. Definite formation of the Wolffian 

 bodies. 



1 6. Growth of the allantois. 



17. The completion of the amnion. 



