1002 MR. F. E. BEDDAED ON 



species each paruterus contains fewer eggs (or embryos) than 

 is the case with Thyscoiotcenia gamhiana. In no case have I 

 seen in a given section more than three embryos within 

 a single paruterine sac in the species which forms the 

 subject of the present communication. In reference to this par- 

 ticular I may compare text-figure 207 with the text-figure of 

 my paper dealing with " Thysanosoma " gambiammi *. The 

 paruterine organs themselves were of abovit the same size in the 

 two species. The presence of so few embiyos in a single par- 

 uterine sac produces naturally a very distinctive appearance which 

 at once distinguishes the two species from each other. In each 

 paruterine organ of Th. lemuris it was possible to distinguish 

 a cortical and a medullary region of difierent appearance. That 

 this was not possible in the other species is probably to be 

 accounted for by the large number of embrj^os which filled them. 

 It will, I think, be admitted that this tapeworm presents char- 

 acters which will not fit in with those of any known genus. It 

 conti^adicts indeed the definitions of families as given by Ransom, 

 at any rate to some extent ; for I should be disposed to place 

 the genus in the neighbourhood of Thysanosoma in the 

 family Anoplocephalidse ; and yet this family is characterised by 

 the absence of a, neck, present in the genvis which is now under 

 consideration. The only other position in the series which this 

 worm could occupy, as I think, is in the subfamily ParuterinfB of 

 the family Hymen olepididaB ; but in this subfamily the paruterine 

 organs are limited to one or two, and there is nothing like the 

 numerous organs met with in both of the species which I describe 

 here under the generic name of Thysanotania. This latter 

 reason as well as the unilateral genital pores prevent the inclusion 

 of the species in the genus Stilesia. 



This new genus, Thysanotcenia t, may be thus defined : — 



ThysanotaBnia, gen. nov. 



Moderately large tapeworms, four to six indies in length and 

 three millimetres in breadth. IScolex unarmed, ivith laterally placed 

 stickers. Proglottids posteriorly as long as or slightly longer than broad. 

 Genital pores unilateral, borne upon a projection of the body near to 

 the anterior end of proglottids. Excretory tubes ivide, one or tivo {and 

 these lying side by side) on each side, toith or without ramified 

 branches. Reproductive organs a single set in each segment. Testes 

 numerous, or very numerous. Uterus a narroiv transverse sac or 

 absent. Many paruterine organs in ripe segments. Eggs tvithout 

 pyriform apparatus. Adults in Mammals. 



* Loc. cit. text-fig. 159, p. 659. 



t Inasmuch as there are no fringes to the proglottids posteriorly such as occur in 

 Thysanosoma, the name selected is rather a misnonif r. I have, however, used it 

 more for the purpose of fixing what I consider to be the systematic position of 

 the worm. 



