74 



is similar to that 

 villous spots. 



OBSTE TRICA L PH YSIOL OG Y. 

 of ruminants \ on its external face are smooth non- 

 Bitch and Cat. 



In the Bitch and Cat, the arrangement of the chorion is similar to that 

 of the Pig ; it has no cornua, its extremities are obtuse, and its inner face 

 is everywhere in contact with tht? allantois, though it does not adhere 

 closely to it. 



Fig. 39- 



FcETUs OF Mare and its Envelopes. 



A, Chorial Sac; C, Amniotic Sac withdrawn from the Allantoid Cavity, and opened to 

 expose the Foetus ; D, Infundibulum of the Urachus ; B, Allantoid portion of the 

 Umbilical Cord: b. Portion of the External Surface of the Chorion destitute of Pla- 

 cental Villosities, and corresponding to the point of insertion of three pediculated 

 Hippomanes. 



Amnion. 



The amnion is the second complete sac enveloping the foetus. It floats 

 freely in the chorial sac, to which it is only attached at a single point, 

 through the medium of the umbilical cord ; and it contains the foetus, 

 which is fixed to its inner face by the same means. It is formed by the 



