652 



MR. F. E. BEDDARD ON 



very end of the body are broader than long. Unilateral genital 

 pores occur only in these two genera among the subfamily or 

 family Anoplocephalid^e or Anoplocephalinfe. There are, however, 

 several genei'a among the lemaining Tetracotylea which possess 

 genital pores in sequence upon one side only. But the number 

 of genera is small and other external characters prevent a con- 

 fusion. Thus the Tapeworm which forms the subject of the 

 pi-esent section cannot be confused with Aploparaksis, Diorchis, 

 GryporJiynchus, Paruterina, Culcitella, Oligorchis, Lateriporus, 

 Dilepis, Davainea, Progenia, Idiogenes, Chapmannia^ Pro- 

 orchida, Monopylidmm, or CyclorcMda, since all of these have 

 a circle or more than one circle of hooks upon the rostellum. 

 There remains Hymenolepis, which is to be distinguished by 



Text-fig. 156. 



Thysannsoma gamhimnim, iiat. size. 

 To the right are a few segments move highly magnified to show genital papilla. 



possessing a " neck," which the present species does not, and by 

 the limited series of testes in each proglottid. I am thus correct, 

 as I believe, in regarding this worm as a member of the Anoplo- 

 cephalida>. • 



There are reasons both for and against refei'ring the Tape- 

 worm from the Gambian Pouched Rat to either of these genera 

 or to a new genus, into which I shall enter at length after 

 detailing its anatomy. This species is a large worm, measuring 



