518 COMPARATIVE ANATOMY AND PHYSIOLOGY. 



the form of a longitudinal septum, which is about 

 an inch in length and terminal in position, so that 

 the vaginal tube opens by two separate orifices into 

 the urino-genital canal. In some examples of, though 

 apparently not in all, Indian elephants, the vagina 

 and the uterus above are divided into two by a still 



Fig. 213. Diagrams to Show the Different Stages of the Mammalian 

 Uterus. 



A, Uterus duplex ; B, uterus bipartitus; c, uterus Incornis ; n, uterus simplex ; 

 od, oviduct ; ut, uterus ; \g, vagina. (After Wiedersueiin.) 



more complete longitudinal septum ; in the rodent 

 Lagostomus the septum is retained in the proximal 

 or uterine, but is absent from the distal, portion of 

 the vagina. As an occasional occurrence, a " vagina 

 duplex " is found in the human subject. 



In those Mammals in which the vagina is com- 

 pletely single we find (1) two quite distinct uteri, 

 each opening by its own os into the vagina (Fig. 213 ; 

 A) ; this condition obtains in the rabbit ; (2) the 

 undivided portion of the uterus is short, as in the 



