116 PROF. M. WATSON ON THE ANATOMY OF THE 
Exterior of Uterus —The uterus consists of a central body or corpus and of two cornua. 
Each cornu, from the point of entrance of the Fallopian tube to the junction with its 
fellow of the opposite side, measures 6 inches in length, and describes a well-marked 
curve, the convexity of which is directed forward. Each of the uterine horns is flattened 
from above downward, and measures # inch in breadth at its junction with its fellow. 
They diverge at once from one another, so as to leave close to their junction an interval 
of a triangular form, which is filled up by peritoneum. The corpus uteri, lying between 
the layers of the broad ligament, measures 7 inches in length from the junction of the 
cornua to its opening into the vagina. It is somewhat flattened from above downward, 
and has a uniform diameter of 1 inch. The corpus uteri lies altogether in front of 
the bladder, and is completely invested by peritoneum. It differs in this respect from 
the vagina, which, lying between the bladder and rectum posterior to the line of re- 
flection of the peritoneum from the uterus to the neighbouring viscera, is altogether 
devoid of serous investment. The body of the uterus is thick and muscular. There is 
no trace in my specimen of the external constriction which, according to Miall and 
Greenwood, indicates the separation of the uterus from the vagina, this separation being 
visible on the interior of the organ only. 
Interior of Uterus (fig. 1, Pl. XXII.).—Upon slitting open the cornua uteri, these are 
seen to be lined by a uniformly smooth mucous membrane, which presents no trace of 
the longitudinal rug so commonly met with in other mammals. From the point of 
Junction of the uterine horns a well-defined septum uteri extends backward through the 
whole length of the corpus uteri, as well as through that of the vagina to the opening of the 
latter into the urino-genital canal. This septum, therefore, separates the body of the uterus 
into two perfectly distinct compartments. It is thick and opaque so far as it lies within 
the cavity of the uterus, but becomes thin and translucent within the vagina. This differ- 
ence in appearance of the septum at different parts is due to the fact that, within the 
uterus, the mucous membrane covering the septum as well as the uterine walls is 
thrown into longitudinal rug, which, few and ill-defined at the junction of the cornua, 
become more numerous and of larger size further back, but cease entirely at the os 
uteri. Within the vagina neither the septum nor the vaginal walls present the slightest 
trace of mucous folds, the membrane being here perfectly smooth and closely adherent 
to the muscular parietes of the canal. In consequence of the complete development 
of the septum uteri throughout the whole length of the body of the uterus, this organ 
communicates with the vagina by means of two distinct apertures or ora uteri—an 
arrangement which is almost identical with that which occurs in the Leporide. In 
the Hares, however, the vagina is simple and presents no trace of the mesial septum 
which in the Indian Elephant (at least in my specimen) separates that tube into two 
distinct compartments. The separation of the uterus from the vagina, although not 
defined externally except by the line of reflection of the peritoneum to the neigh- 
bouring viscera, is indicated in the interior of the organ by two well-defined folds of 
