FEMALE ORGANS OF PERISSODACTYLA. 693 



or posterior surface applied to the urogenital canal ; two muscles, 

 answering to the levatores penis in the male, converge and unite 

 upon the upper or anterior part of the clitoris, and send their 

 common tendon through a sheath to terminate near the glans : 

 this is composed of a vascular corpus spongiosum. 



§ 390. In Perissodactyla. — The ovaria, in Rhinoceros Indicus, 

 are included within a large peritoneal sac, communicating with 

 the general abdominal cavity : they are compact, oblong and 

 subcompressed. The oviducts commence by wide orifices, having 

 a richly fimbriated margin : their diameter at the expanded end 

 equals two-thirds of an inch, but they gradually diminish in size 

 as they pass in a slightly tortuous course along the parietes of 

 the ovarian capsule towards the uterus : just before they enter 

 the cornu their diameter does not exceed one-third of a line. 

 They terminate in the extremity of the cornu upon a valvular pro- 

 tuberance about the size of a pea, which is divided into four or five 

 processes. The ' cornua uteri' are each seventeen inches in length: 

 the ' corpus uteri ' only an inch and a half. The cornua are 

 occupied by close-set longitudinal folds : the inner surface of the 

 corpus is smooth. The vagina, about sixteen inches in length, 

 is divided by a constriction from the urogenital tract, which is 

 three inches long. The upper or uterine third of the vagina is 

 occupied by broad transverse folds, the lowest of which is most 

 extensive. 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 parietes of the vagina, but passes across in an 

 oblique direction: then follow in quick succession a series of 

 shorter but equally broad semilunar folds, which become alternate 

 in their relative position as they approach the uterus, so as to 

 cause the cavity of the vagina to assume a spiral course : as 

 these valvular folds also assume a thicker, softer, and more 

 vascular texture, it is by no means easy to determine where the 

 vagina ends or the uterus begins. 1 The structure resembles 

 that in the Tenrec and some other Lissencephala. The urethra 

 opens into the urogenital passage just beyond the vaginal con- 

 striction. The lateral apertures of the ' Malpighian canals ' are 

 about an inch and a half from the vulva. These canals expand, 

 and then divide and subdivide, terminating in blind ends near 

 the beginning of the vagina. 2 The i preputium clitoridis ' and 

 urogenital canal open externally by distinct but approximate 

 narrow elongate orifices : the vulva opens about five inches from 

 the vent. 



1 v*. p. 52, pi. 18. 2 lb. M, m. 



