Page 104. 
142 VISCERAL ANATOMY OF THE SUMATRAN RHINOCEROS. 
The Spigelian lobe is most peculiar, mainly consisting of a thin 
strip of hepatic tissue, 8 inches long, uniformly ? inch wide, and {inch 
deep. At its attached end it becomes somewhat larger, and presents 
a free border superiorly for about an inch. 
There are three large hepatic veins, which spring just above and 
behind this lobe, on their way to the vena cava. 
The pancreas is irregular, not large nor concentrated. 
The spleen is very thin and flat; it forms an elongated oblong, 
rounded at one end and squared at the other. Its length is 25 inches, — 
and breadth 8 inches. It is slaty in colour, and weighs 2{ Ib. 
The kidneys are flattened and oval in form. One is 6 inches 
broad by 2 inches long. They are nearly equal in size, and together 
weigh 10 lb. The hilum is linear, and on the inferior surface, not at 
the margin. They are lobulated externally, but not so much as the Seals. 
The heart presents no peculiar features. The whole organ weighs 
10 lb. when emptied of clots. The annulus ovalis is well marked, 
and forms a considerable fold over the fossa ovalis. The commencing 
aorta, which is 4 inches long and 34 inches across, divides into two 
nearly equal branches, one of which is continued on as the arch of the 
aorta, with a diameter of 1°85 inch; the other gives off the vessels to 
the head in the following manner. Immediately after the main divi- 
sion of the vessel into two parts, the innominate gives off the left 
subclavian, which, again, is much divided up. The innominate then, 
3 inches above its origin, divides into the right subclavian and the 
common carotid trunk, which latter, after a simple course of 23 inches, 
divides into the right and left common carotids. This disposition is 
very much like that of the Llama as drawn by Professor Owen. The 
thickness of the ventricular septum is 14 inch. 
The lungs are extremely simple, coniform, and undivided, except 
at their apices, where, as in many animals, they send down small lobes 
which overlap the auricles of the heart. They are nearly equal in 
size, being 25 inches long by 15 deep and 5 broad. They weigh each 
94 lb. (uncongested). 
The uterus is two-horned. The corpus uteri is 3} inches long by 
24 inches broad; the cornua are 16} inches, by 2 inches broad; they 
are both very distinctly longitudinally plicated. The os uteri is much 
folded, and the orifice is quite small; from it to the orifice of the 
urethra is 12 inches. The vagina is lined with a squamous epithelium, 
and it presents a few transverse folds about 3 inches apart. Its cir-- 
cumference in the middle is 15 inches, at its orifice 9 inches. The 
urethra is 2 inches long, and admits two fingers. 
The length of the elongate fringed orifices of the Fallopian tubes is 
5 inches. 
The clitoris and vulva are similar to those of the Indian species. 
