82 



DR. J. W. JENKINSON ON THE 



[Feb. 6, 



that in these terminal processes the chorion as well as the 

 allantois is involved ; according to this observer, the chorion is here 

 not vascular, and quickly degenerates and crumples up ; it is then 

 " von gelblich kiisigem Aussehen," a very apt description of its 

 appearance. 



Text-fi2-. 30. 



.-h.yc 



Section througli one side of the chorionic ring and base of the diverticulum allan- 

 toidis of the Sheep, d.a. ; the degenerate trophoblast and degenerate allantoic 

 epithelium are indicated in dotted outline. At the base of the diverticulum 

 allantoidis its connective-tissue lamella passes between the two muscular 

 sphincters (sp/i.) to join the thick connective-tissue of the chorionic ring ; here 

 the allantoic epithelium {all.) and the trophoblast (tr.) are intact, h.v., blood- 

 vessel. 



Sections (text-fig. 30) show that outer trophoblastic and inner 



