HTT^OTA : ON THE SERO-AMXTOTTr' fOXXEr-TTOX. 



0. Effects of the Sero- Amniotic CoiincctiôH on the 

 Foetal 2Ieui]ir(ines. 



About the time when the amniotic cavity is closerl the allantois 

 appears on the viulit side of the embryo in front of the level of the still 

 rudimentarv right hind hmb ; and it spreads itself graduully between 

 tlie serous envelope and the amnion. 



The first structure which we notice, and which seems to owe ka 

 ori""in to tlie presence of the sero-aniniotic connection, is a curious 

 infolding- «^f the amnion near the connection, given in Diag. 5. It is 



Diag. 5. 



Yolk. 



Transverse section of an embryo thront^h 

 the alhintois and tlie fold. 



Diag. 6. 



;Mio Oo nneo tian. 



Tjontjitudinal section throui;-li the 

 sero-a mniotic connecta* >n. 



alw^ays on the right side of the eonnection and is pushed on towards 

 the left. There takes place no folding before the allantois appears, and 



