998 MR. F. E. BEBDARD ON 



worm is like the adult ThysanotoivAa gavibiana in its characters. 

 Thus the proglotticls do not increase at all appreciably in length 

 until the very end of the body, those anterior to this being- 

 broader than long. It is, however, clearly a difference between 

 the two species that there are in Thysanotcenia lenittris a much 

 longer series of proglottids of greater length than diameter, a,nd 

 that the conical projection of the body which bears the generative 

 pore is more pronounced. Furthermore, while the species described 

 in the present communication has along neck, there is no neck in 

 7%. gcwibiana, the strobilisation commencing immediately after 

 the scolex. Finally, Th. lemuris has black pigment in the scolex, 

 v/hich is wanting in Th. gamhiana. There are thus several 

 obvious differences between the species, which as I think prevent 

 any confusion between them. 



In transverse sections (text-figs. 206, 207) it was only 'possible 

 to see a single tvater-vascular tube on each side. This is of con- 

 siderable diameter, though it fluctuates in size from place to place 



Text-fio-. 206. 



Thysanotcenia lemuris. Two sections across .a proglottid, one of wliich (on the 

 riji;lit) shows the genital papilla. . The lialt only of each complete section is 

 shown. B..S , Receptaculum seminis ; Sp.d., spenn-cluct ; T., testes scattered in 

 parenchyma; T'a., vagina; JF., excretory tube. 



and is connected with its fellow in each proglottid by a transverse 

 tube, which lies near to the posterior boundary of the proglottid. 

 The single water- vascular tube of this species appears to represent 

 by its position the innermost of the two tubes found in Thysano- 

 Uenia gavibiana. I could find no network of minute tubules arising 

 from these, such as are obvious in the last mentioned species. 



Genital organs. — On the whole, the genital system of the species 

 dealt with in the present communication is not very like that of 

 Thysanotcenia gamhiana. There is, however, a very important 



