1901.] 



NATURAL SCIENCES OF PIIILADELPIIIA. 



369 



Deciduous 



Placenta -{ 



Discoidal 



Zonular 



f Diffuse 



I Non -deciduous 



Cotyledonary 

 Cricoid 

 i. Discoidal 



Primates, etc. 



Brady pus. 



Elephant. 



Carnivora. 



Orycteropus. 

 f Sus. 

 \ Manis. 

 r Bos. 

 I Ovis. 



Dasypus sexciactus. 

 f Dasypus novemcinctus."' 

 t Tamandua tridactyla. '* 



EXPLANATION OF PLATE XVIIL 



Fig. 1. — Young Armadillo and foetal face of placenta. 



Fig. 2 — Uterine face of placenta. 



Fig. 3. — A villous process of the chorion. 



Fig. 4. — A portion of the same as seen when magnified. 



^® Incertum sedis. 



24 



