82 



DR. J. W. JENKIKSON 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 kjisigem Aussehen," a very apt description of its 

 appeai-ance. 



Text-fig. 30. 



.^.y: 



Section througk one side of the clioriouic 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 (sph^ to join the thick connective-tissue of the chorionic ring ; here 

 the allantoic epithelium (a?7.) and the trophoblast (tr.) arc intact, h.v.^ blood- 

 vessel. 



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



