XII 



PHYLUM CHORDATA 



521 



with fimbriated or fringed margins. Posteriorly each passes 

 into a thick-walled uterus. The two uteri open sepa- 

 rately into a median tube, the vagina (va). The vestibule 

 (Fig. 312, vb), or urogenital canal, is a wide median 

 passage, into which the vagina and the bladder open. On 

 its ventral wall is a small, hard, rod-like body, the clitoris, 

 corresponding to the penis of the male, and composed of 

 two very short corpora cavernosa attached anteriorly to the 



fit lit 



1Mb' 



va. 



T.Ut 



FlG. 313. Lepus cuniculus. The anterior end of the vagina, with the right uterus, 

 Fallopian tube, and ovary (nat. size). Part of the ventral wall of the vagina is 

 removed, and the proximal end of the left uterus is shown in longitudinal section 

 fl. t, Fallopian tube; fi. t' , its peritoneal aperture; /. ut, left uterus; /. nt' ', left 

 os uteri; r. ut, right uterus; r. nt' , right os uteri; s, vaginal septum; z>a, 

 vagina. (From Parker's Zootomy.') 



ischia, with a terminal soft conical glans ditoridis (g. cl] . 

 The vulva, or external opening of the vestibule, is bounded 

 laterally by two prominent folds, the labia majora. 



The rabbit is viviparous. The ovum, which is of rel- 

 atively small size, after it has escaped from its Graafian 

 follicle, passes into the oviduct, where it becomes fertilised, 

 and reaches the uterus, in which it develops into the fatus, 



