52 PROF. OWEN ON THE ANATOMY OF THE INDIAN RHINOCEROS. 
care under the microscope, but the granular layer was evidently broken up by decoin- 
position, and the ovulum was invisible. The animal had been dead a fortnight. 
The Fallopian tubes or oviducts commence by wide orifices having a richly fimbriated 
margin (Pl. XVII. f,f); their diameter at the expanded end equals two-thirds of an inch, 
but gradually diminishes in size as the tube passes in a slightly tortuous course along 
the parietes of the ovarian capsule towards the uterus ; just before they enter the cornu 
uteri their diameter does not exceed one-third of a line ; they terminate in the extremity 
of the cornu upon a valvular protuberance about the size of a pea, which is divided 
into four or five processes (Ib. p). The inner surface of the oviduct is augmented by 
short irregular longitudinal folds or processes of the lining membrane. Each oviduct 
is fourteen inches in length. 
The cornua uteri (Ib. u', wu) are each seventeen inches in length, and uniformly 
about an inch in diameter; their area is occupied by close-set longitudinal folds of the 
lining membrane, about a quarter of an inch in breadth, and having a wavy irregular free 
margin. There is no appearance of processes for the attachment of cotyledons. Where 
the cornua join the body of the uterus, the crenation or scalloping of the longitudinal 
folds becomes shorter and deeper. The length of the common uterus (Ib. cu) is 
about one and a half inch. The surface of its lining membrane is smooth, and pre- 
sented, when first exposed, a leaden hue. ‘The place of the ‘os tince’ is occupied by 
a complex and remarkable structure, which will be described as it was traced from the 
vagina towards the uterus. 
A large transverse semilunar fold (Jb. f,f) projects from the upper and lateral 
parts of the vagina; the upper and broadest part of the fold is one inch ; it gradually 
diminishes as it descends on each side, and the cresses are lost about four inches from 
the vaginal orifice, and about an inch and a half from the middle line of the lower sur- 
face. About an inch above this fold, or nearer the uterus, a second and smaller fold is 
formed, which also descends from the upper and lateral walls of the vagina, but passes 
across in an oblique direction. Then follow in quick succession a series of shorter, 
but equally broad semilunar folds (Jb. f', f'), which become alternate in their relative 
position as they approach the uterus, so as to cause the vagina to assume a spiral course 
not very unlike the disposition of the intestine in the Shark. As these valvular folds 
also assume a thicker, softer, and more vascular texture as they approach the uterus, 
it is by no means easy to determine where the vagina ends or the uterus begins. 
Measuring from the thickest fold which most resembles an os tince, the common uterine 
cavity does not exceed two inches in length: and in this short extent, compared with 
the cornua, the Rhinoceros resembles the Elephant. 
The form, size, and relative positions of the vulval and preputial orifices have been 
already described. The length of the common or urogenital canal (Jb. v, ug) was 
four inches; its diameter about three inches. On each side, and about one inch and a 
half from the external outlet, were situated the apertures of the Malpighian or mucous 
