XIX. ON SOME INDIAN CESTODA. 



Part I. 



By T. Southwell, A.R.C.S. (Lond.), F.L.S., F.Z.S., 



Depy. Director of Fisheries, Bengal, Honorary 



Assistant in the Lndian Museum. 



The present paper on the Cestoda of British India is the first 

 of a series which the writer proposes preparing, as opportunity 

 permits. 



Up to a very short time ago the number of species of Cestoda 

 in the collection of the Indian Museum did not exceed twenty. 

 These are all included in the present paper, together with much 

 fresh material. 



It is proposed in the second paper of this series to deal with 

 Cestoda from birds, of which about 50 species have been collected 

 up to date, and in the third with Cestoda from fish, of which we 

 have at present about 70 species. 



For the characters of the order Pseudophyllidea and the sub- 

 family Dibothriocephalinae I am indebted to Stiles (igo6). 



The characters of the families Mesocestoides, Anoplocephalidae, 

 Davaineidae, Hymenolepididae and Taenidae, with their sub- 

 families and genera, are those given by Ransom (1909), whilst 

 the characters of the genera Rhynchobothrium, Tetrarhynchus, 

 Otobothrium, and Syndesmobothrium are after Linton (1887). 



Order PSEUDOPHYLLIDEA, Carus, 1863. 



= BoTHRiocEPHALOiDEA, Brauu, 1903. 



General diagnosis : — Cestoda. Scolex armed or unarmed, with 

 two groove-like suckers, situated dorsally and ventrally ; they are 

 usually not highly developed, but in some cases are considerably 

 modified by development of their walls, or by more or less coales- 

 cence of their margins ; or they may unite to form a single apical 

 sucker, or ma}- become rudimentary, their function being performed 

 by an unpaired apical sucker. In some cases a pseudo-scolex may 

 form. External segmentation present or absent. Neck present or 

 absent. Three genital pores present; uterine pore is always on 

 one of the surfaces ; the vaginal and cirrus pores may be on the 

 same surface as the uterine, or on the opposite surface, or 

 marginal. Genital organs usually single, rarely double. Their 

 development progresses from anterior end, posteriorly, but does not 



