Embryology. , 783 
by the decidua, and v the vagina. We may suppose Fig. 2, A, 
-to represent a type intermediate between that shown in Fig. I 
and that represented in Fig. 2, at B, which is that characteristic 
: of certain Carnivora, —the Cat, for example. In C, Fig. 2, the 
uniparous types, to be next described, we find that portions of 
right and left halves of the uterus present more or less 
mucous surface to the single chorion which they enclose. In 
Dugong, while, if the villi are aggregated into little tufts mainly 
i like D. With the still greater specialization of the uterus, as a 
5 E. of which its cavity is no longer tubular, but pyriform, in 
gravid state, as shown at E, Fig. 2, other modifications of 
Wat of thè Old World monkeys are further modifications of a 
aee which must have been primitively zonary oF diffuse, as 1s 
€ 
fact th D, Fig. 2. Such a view is further countenanced by the 
TG - in its earliest condition the placenta of the Primates 1s 
~ sally diffuse in its character. 
These bare ar ; f the surface 
the q o S areas seem to have arisen in consequence of the failure of t 
Cae Tennis to come into intimate contact with a vascular maternal eames 
