ON TWO xVEW TBEMATODBS. 851 



50. On Two new Tremutodo Parasites f'ron^i the Indian Cobra. 

 By William Nicoll, M.A., D.8c., M.D., F.Z.S., Lister 

 Institute o£ Preventive Medicine, London. 



[Received May 28, 1912 : Read June 4, 1912,] 

 (Text-figure 122.) 



Index. 



Page 



Ethology : Two new Treinatode parasit'^s in tho ;^al]-bladder 



and ureters of the Indian Cobra {Naja IripwUant) 851 



Geo^apliical Zoology : India ; Cobra, two new Dukes from 



the gall-bladder and ureters 861 



Systematic : 



Xenopharynx (gen. n., Farn. Dicrocceliidje) $olu$, sp. n., 



from gall-bladder of Indian Cobra 861 



Slyphlodora naja, sp. n., from ureters of Indian Cobra, 

 closely resembles H. horrida Leidy 854 



In an Indiaji Cobra {Naja tripvdians) which died in the 

 Zoological Society's Gardens on 11th October, 1911, a few speci- 

 mens of two interesting new Treinat(jde parasites were found. 

 Of the first of these a single specimen was found in the gall- 

 h)ladder; of the second, four somewhat macerated specimens were 

 met with in the ureters. Four different species of Nematode 

 parasites were also present in the same animal, so that altogether 

 it was infected with six different species of parasitic worms. 



The first species belongs to the family JJicroco^liida^; and is of 

 particular interest from the fact that members of this family 

 are not commonly found in Reptiles. Hither-to the only typical 

 representative in Reptiles is that described by de Faria (1910). 

 The present species shows most of the cliaracteristic features of 

 the family, but at the same time it exhibits several divergences of 

 such importance as to warrant its being regarded as the type of a 

 new genus. For that genus I propose the name Xenophmrynx. 



Xexophaeynx solus, gen. et sp. n. (Text-fig. 122, B.) 



Only a single specimen was found in the gall-bla/lder. It 

 measures 4"5.5 mm. in length and 1"68 mm. in greatest breadth, 

 which is about the middle of the body. The outline is almost 

 elliptical and the body is fairly fiat. There are no cuticular 

 spines. 



The oral .sucker ha.s a diameter of "42 mm., but its length is 

 only "30 mm. The ventral sucker is circulai-, with a diameter of 

 •41 mm. It is situated 1'13 mm. from the anterior end. The 

 neck is therefore almost exactly one-foui-th of the body-length. 



The pharynx is contiguous with the oral sucker and measures 

 •22 X ^24 mm. It possesses the curious sliape shown in text-fig. 

 122, B. At first sight this shape was thought to be the result of 



