430 THE EVOLUTION OF MAN. 



lower part of the uterus the vagina-canal passes out on each side. The 

 ovaries and testes begin to move downward from their place of formation. 



XIII. Thirteenth Period : Urogenitals of Semi.apes. 



The lower parts of the Miillerian and the Wolffian ducts coalesce into 

 a sexual cord. The coalescence of the two uteri at the lower part gives 

 rise to the uterus bicornis. A part of the allantois becomes the placenta. 



XIV. Fourteenth Period : Urogenitals of Apes. 



The two uteri coalesce throughout their entire length, forming a single 

 pear-shaped uterus, as in Man. 



