TRANSACTIONS OF MICROSCOPICAL SOCIETY. 
DESCRIPTION OF PLATE II, 
Illustrating Mr. Blenkins^s paper on an Early Human Ovum. 
Fig. 
1. — Natural size of ovum. The chorion opened and partly removed to 
expose the embryo. 
2. — One of the villi of the chorion, highly magnified, taken from the point 
where the allantois joins it. At a, it is nearly torn across, and shows 
its tubular character and the absence of blood-vessels. 
3. — Magnified view of fig. 1. 
A. Cephalic extremity, in which the rudimentary eye is distinctly 
seen. 
B. Umbilical vesicle. 
c. Shows where the vesicle was divided in opening the chorion. 
E. Allantois, with the duct running through it ; a bristle is passed 
beneath. 
E. Intestine communicating with the umbilical vesicle above and 
with the duct of the allantois below. 
F. Heart. 
G. Chorion, with its numerous branching villi. 
