ON OPHIDIAN TAPEWORMS. 153 



PAPERS. 



12. Contributions to the Anatomy and Systematic Arrange- 

 ment oE the Cestoidea. By Frank E. Beddard, M.A., 

 D.Sc, F.R.S., F.Z.S., Prosector to the Society. 



[Received November 4, 1912 : Read February 4, 1913.] 



VITI. On some Species of Ichthyotcenia and Ophidotcenia 

 FROM Ophidia. 



(Text-figures 33-38.) 



Index. 



Page 

 Introductory I53 



Ichthyotcenia gahonica, sp. n 153 



Ophidot(Enia russelli, sp. n 160 



Ichthyotcenia sp. ? 164, 



In the present communication I lay before the Society the 

 result of an investigation into the anatomy of a number of 

 species of tapeworms which I have obtained during the last 

 three years from the gut of serpents, and all of which are 

 members of the family Ichthyoteeniidse. 



The parasites of serpents are obviously but incompletely known 

 at present. The only well-known genera which have been seen 

 in those reptiles are Solenophorus from certain pythons*, a few 

 species of Ichthyotcenia "^ from various species of serpents, Cre- 

 pidobothrium % from boas, Ophidotfjenia § from the Indian cobra 

 Oochoristica || from Zmnenis viridijiaviis. 



Ichthyotsenia gabonica, sp. n. 



I obtained on June 21, 1912, a number of tapeworms from 

 Bitis gabonica, which I refer to a new species and name as above. 

 I am not able to give the exact length of the worm, but the 

 largest piece which I measured was 150 mm. We are safe, there- 

 fore, in allowing its length to be not less than 160 mm., and 

 probably rather more. The scolex is intermediate in size between 

 that of such species as Crepidohothrium gerrardi, which has a 

 particularly large scolex, and such species as Ophidotcenia naice, 

 which has a particularly small one. The transverse diameter is 

 about two-thirds of a millimetre. As the greater part of the 

 scolex is taken up by the suckers, each of these is fully a quarter 



* Bronn's ' Thierreichs,' Bd. iv. Abth. 1 B, and literature therein cited, 

 t v. Linstow, " Helmintlien von Java," Notes Leyd. Mus. xxix. 1908 p. 85. 

 X Monticelli, Atti Soc. Nat. e Mat. Modena (4) i. 1899, p. 9. > • • 



§ Beddard, P. Z. S. 1913, p. 25 ; also Scliwarz, •' Ichthyotseiiien d. Kept " Inauo- . 

 Diss. Basel, 1908. 



II Zschokke, " Das Genus Oochoristica," Zeitschr. wiss. Zool. Ixxxiii. 1905. 



Proc. ZooL. Soc. — 1913, No. XI. 11 



