ox AVIAN CESTODES. 



861 



49. Contributions to the Anatomy and Systematic Arran<ie- 

 meut of the Gestoidea. Hy Frank E. Beddard, M.A., 

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



[Received August 27, 1913 : Read October 28, 1913.] 



XI. On a new Tapeworm from CEdica^emvs. 

 (Text-figm-es 141-149.) 



Index. 



Page 



.Eugonodrsum oedicnemi, gen. et sp. u 861 



Characters of JEugonodceuni. 877 



Egg-cavities of OoehoHstica 874 



General observatioiis 876 



In Prof. Fuhrmann's exhaustive list of Tnpewoiius * (of the 

 Cyclophyllidea only) which occur in birds, only one parasite 

 of this order is recorded from an (Edicneinus. The species in 

 question is Choanotcenia coronata, and it occurs in the European 

 (Edicnemus cedicnevius. I was, therefore, particularly interested 

 to find in a New World .species of the genus, viz. (Edicnemus 

 histriatus, a number of examples of a tapeworm which does not 

 belong to the genus CJioaiiotcmia, though it should probably be 

 referred to the same family and even subfamily. 



I shall, however, defer the consideration of the systematic 

 position of this Cestode until an account has been given of its 

 anatomical characters. 



The species dealt with in the present communication was 

 obtained from a Thick-knee of the species mentioned above, which 

 died in April of the present yeai', and had lived in the Society's 

 Gardens for a year. It is not unlikely, therefore, that the tape- 

 worms had infected the bird before its arrival. But no fact 

 of importance can be at present deduced as to locality, since the 

 very parasite of (Edicnemus oxlicnemihs mentioned above has 

 been also discovered in ^Eyialitis nivosa, which is an American 

 bird. 



The (Edicnemus histriatus contained no other tapewoi'ms in its 

 intestine, except that which forms the subject of the present 

 communication to the tSociety. I am not quite certain how 

 many individuals there were ; but there were at any rate six or 

 seven. The w^orms ai'e somewhat slender and measure at least 

 120 mm. I infer this from the fact that one of the largest 

 fragments, consisting of both rij)e and unripe proglottids, measured 

 110 mm. ; but, as it had no scolex nor trace of the thin neck, at 

 least 10 mm. may be added safely. The greatest breadth of the 



* " Die Cestodeu der Vogel," Zool. Jahrli. Suppl.-Bd. x., 1908. 



Proc. Zool. Soc— 1913, No. LYIII. 58 



