164 PERISSODACTYLA. 



passage between the vein and the spines, and through this passage enters 

 a lobe of the right lung, and lies there. The vena cava between the 

 heart and the diaphragm is about 4 inches. 



The ventricles of the heart x are very smooth, having very few fasci- 

 culi, only a fleshy column r unnin g between the sides of the ventricle. 



The length of the ass from its head to [the end of the] hind feet is 

 8 feet ; the small guts are 40 feet ; the great ones 17 feet ; in all 57 

 feet 2 . The whole intestinal canal is, therefore, seven lengths and one 

 eighth of the animal. 



The ereetores clitoridis are as in the human subject. The clitoris is 

 made up of a strong tendinous coat, which is so thick for 2 inches as to 

 make it stand prominent ; and along the upper part it is cellular, but 

 still contained in the strong coat. This coat becomes thin, and the 

 cellular body becomes larger, which is a little prominent in the external 

 vagina, and has a number of e min ences on its external surface, of a 

 black colour, standing at the beginning of the external vagina. The 

 plexus retiformis is as usual ; but the cells are very large, and there 

 seems to be a large cavity in the middle. The sphincter vagina is as 

 in the human, covering the plexus. 



At the beginning of the true vagina, and at the beginning of the 

 meatus urinarius, there is a doubling of the vagina, which is veiy 

 broad, on the lower surface or next the urethra, but becomes narrower 

 towards the anus ; so that that part next the urethra acts as a valve, 

 hindering the urine from getting into the vagina. This is the remains 

 of the hymen 3 . 



From the external labia to the beginning of the vagina is about 

 4 inches, forming a passage much the size of the vagina itself, but 

 rather larger : it is smooth, has a vast number of orifices of glands up 

 and down it, and it is on this part of it that the sphincter vagina 

 is placed, with the plexus. The urethra is made up of a strong circular 

 muscle through its whole length ; the muscular coat of the bladder does 

 not terminate in the muscular coat of the urethra, but as it approaches 

 the neck it becomes denser, and afterwards becomes ligamentous ; but 

 where it is lost I don't know. The vagina is about seven inches long, 

 with a great deal of white mucus, like cream. The os tineas projects 

 about an inch within the vagina, is about as thick as one's thumb, and 

 is not smooth but scabrous. The uterus is about 7 inches long, and of 

 a pyramidal figure; for, from the beginning of the os tincae, it is 

 becoming larger and larger towards the fundus : it is thickest at the os 

 tineas, becoming thinner and thinner ; at the os tinea? there are a great 



1 [Hunt. Preps. Nos. 928, and 865, 866 (showing absorbents on the ventricles).] 



2 [Home, Comp. Anat. i. p. 451.] 3 [Hnnt. Prep. No. 2839.] 



