388 G. A. and W. G. MacCallum, On the structure of Taenia gigantea (Peters). 



Snmniary. 



In view of the general resemblance to the worms described by 

 Peters and Mueie, we assig-n this enormous parasite to the species 

 Taenia gigantea. Its head, not seen by us but described by Peters, 

 is unaimed except by four suckers. The structure of the worm 

 resembles closely that of other members of the genus Taenia, the 

 only striking- dift'erence being the curious atresia of the vagina after 

 fertilization. This explanation is given tentatively, although the 

 careful examination in serial sections of a considerable number of 

 Segments reveals the condition constantly. 



