430 THE EVOLUTION OP MAW. 



low«r part of the nteras the ragina. canal passes ont on each tide. Ae 

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



XIII. Thirteenth Period : Urogenitals of 8em%.a/pe», 



The lower parts of the Miillerian and the Wolffian dncts ooalesee into 

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

 riie to the uterus hicomia. A part of the allantois becomes the plaoenta. 



XIV. Fourteenth Period : Urogenitals of Apes. 



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

 pear-shaped uterus, as in Man. 



A 



