ON TWO NEW TEEMATODES. 851 



50. On Two new Trematode Parasites from the Indian Cobra. 

 By William Nicoll, M.A., D.Sc, 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 Trematode parasites in the gall-bladder 



and ureters of the Indian Cobra {Naja tripudians) 851 



Geographical Zoology : India ; Cobra, two new flukes from 



the gall-bladder and ureters 851 



Systematic : 

 Xenopharynx (gen. n., Fam. Dicrocoeliidse) solut, sp. n., 



from gall-bladder of Indian Cobra 851 



StyjpModora najce, sp. n., from ureters of Indian Cobra, 

 closely resembles /S. liorrida 'LQiAy 854 



In an Indian Cobra {Naja tripudians) which died in the 

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

 mens of two interesting new Trematode parasites were found. 

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

 bladder ; 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 pai'asitic worms. 



The first species belongs to the family Dicrocoeliidse and is of 

 particular interest from the fact that members of this family 

 are not commonly found in Reptiles. Hitherto the only typical 

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

 The present species shows most of the characteristic 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 Xenopharynx. 



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



Only a single specimen was found in the gall-bladder. It 

 measures 4-55 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 flat. There are no cuticular 

 spines. 



The oral sucker has 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-fourth of the body-length. 



The pharynx is contiguous with the oral sucker and measures 

 ■22 X '24 mm. It possesses the curious shape shown in text-fig. 

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



