G92 



ANATOMY OF VERTEBRATES. 



Uterus of Dugong. CCXLVIII". 



388. In Sirenia.- In both Ilalicore and Rliytina the vagina, 

 fig. 544, o, is characterised by longitudinal rugae : the body of the 



544 uterus, c, is relatively 



longer than in Cetacea, 

 and, in the young un- 

 impregnated Dugong, is 

 wavy : the cornua di- 

 verge at right angles, are 

 more slender, and less 

 arched : there is a well- 

 developed ' os tincre.' 

 The vulva is situated 

 further in advance of 

 the vent. In Rhytina 

 Steller describes the clitoris as of a hard texture, an inch and a 

 half long, situated at the anterior broader part of the vulva, which 

 is eight inches anterior to the anus. 



o 



389. In Prol>oscidia.--\n a half-grown female Elephant 

 (JSlephas Indicus, Cuv.), the ovaria are small oblong bodies, with 

 an irregular tuberculated exterior and large proportion of stroma: 

 the ovarian apertures of the oviducts are provided with numerous, 

 long and slender branched processes, like a loose tassel. Each 

 tube makes a long bend upon itself around a deep and narrow 

 ovarian capsule, and maintains a slightly tortuous course to the 

 uterus. The body of the uterus is very short ; the cornua are 

 long and wide ; their inner surface is broken by a few slight 

 transverse puckerings on the concave side. The body of the 

 uterus presents two large semilunar folds, and the os tinca3 is 

 represented by three similar successive and alternate folds, which 

 form the boundary between the uterus and vagina : the latter is 

 divided from the urogenital canal by a constriction, in which, 

 viewed from the urogenital side, there appear three small aper- 

 tures : the middle one leads to the vagina ; the lateral ones to 

 the mucous sinuses, called ( canals of Malpighi.' The internal 

 surface of the vagina presents a few slight and irregular rngje ; 

 those of the urethro-sexual canal affect a more regular, and in 

 some places a penniform, arrangement : the urethra terminates 

 immediately beyond the constriction. The clitoris measures 

 fifteen inches in length. The two crura are attached to the 



O 



rami of the os pubis : they are of a dense cavernous texture, and 

 are joined together to form the body of the clitoris : this is in- 

 closed in a strong ligamentous capsule. After the junction of 

 the crura the clitoris descends along the perineum, with its under 



