132 MR. R. OWEN ON THE ANATOMY OF THE CHEETAH. 
before joining the hepatic. The common duct enters the duodenum 1 inch from the 
pylorus, joining the pancreatic between the coats of the intestine. The form and 
divisions of the liver are as above described. 
The pancreas in the feline tribe is composed of two parts, both having an entire in- 
vestment of peritoneum. One passes from the spleen to the duodenum behind the sto- 
mach, lodged between the layers of the posterior part of the great omentum ; the other 
follows the curve of the duodenum, describing a circle, and inclosed between the layers 
of the duodenal mesentery. The gland is conformable to this type in the Cheetah. 
The spleen in the Cats is invariably of a compressed elongated form, of nearly uni- 
form breadth, and its cells are much smaller than in herbivorous Mammalia. In the 
Cheetah this part is 7 inches in length, and 14 inch in breadth, with the lower end bent 
out of the long axis. 
The kidneys in the Cheetah are prominent, with the same proportion of the venous 
blood returned by arborescent superficial veins as in the rest of the feline tribe: a 
structure which is also found in the Swricate, Genets, Civets, and Hyenas, (and in 
connexion with the feline form of cecum); but which does not exist in the Dog. 
The chest in the Cheetah has not the same proportionate size as in the Lion. The 
lungs are on the right side divided into three lobes and the lobulus impar; on the left 
into three: the superior cleft on this side varies in depth in the different species. 
The trachea is large, as in all the Cat tribe, with the cartilages dilated and sometimes 
bifid at their posterior extremities ; the muscular and membranous interspace in the 
Cheetah is an inch in breadth; andthe number of cartilages 41. The heart is 3+ inches 
in length, and 2+ in breadth. The aorta gives off the left carotid with the right carotid 
and subclavian by a common trunk, the left subclavian coming off separately. This 
disposition I have found in all the feline animals which I have examined at the Society’s 
Museum ; but it is not peculiar to the genus Felis. There is one superior vena cava. 
The testes in the Cheetah are situated in a sessile scrotum 4 inches from the anus: 
they are each 10 lines long, and 7 lines broad: the epididymis is large in proportion to 
the gland. The penis in the unretracted state is 4 inches in length, the glans pointed 
and armed with retroverted papilla, as in all feline animals, and without any bone. 
The tongue is beset with retroverted cuticular papille, occupying its anterior third, 
but not extending to the margin. The lytta, or rudiment of the lingual bone, so con- 
spicuous in Dogs, is here reduced, as in the other feline animals, to a small vestige. 
The elastic ligaments of the ungueal phalanges exist in the same number and rela- 
tive position as in the Lion, but are longer and more slender : if the last joint is forcibly 
drawn out, they retract it to a certain extent ; but this, as is well known, is insufficient 
to preserve the claws so sharp as in the rest of the Feles. 
It will thus be seen, that in the circulating, respiratory, digestive, and generative 
systems, the Cheetah conforms to the typical structure of the genus Felis. 
In the nervous system the same correspondence appears also to exist; but with 
