SOME MAMMALIAN TAPEWORMS. 



633 



ovaries, reaches from near to the anterior boundarj^ of the pro- 

 glottid to beyond the middle of a segment. The testes occupy 

 a restricted area in the posterior region of the segment, and 

 I observed in these young proglottides something like 20 or 30 of 

 them. They are not in contact with the ov^aries, but, like them, 



Text- fig. 150. 



t. 



t. 



Transverse section of a posterior segment of Oochoristica sp., showing 

 scattered erabrj'os embedded in general parenchyma. 



e. Embryo, t. Longitudinal trunks of water- vessels. 



are median in position. I occasionally observed also 2 or 3 testes 

 on one side of the ovary. Further back, when the genital ducts 

 first appear, the testes still form a mass which is chiefly postei"ior 



