ON A XEW RBPTILIAX TREMATODE. 933 



53. A New Trematode of the Genus Lecliriorchis from the 

 Dark Green Snake (Zamenis gemoneiisis). By Marie 

 V. Lebour, M.Sf., Assistant Lecturer and Demonstrator 

 in Zoology, Leeds University *. 



[Received September 20, 1913 : Read November 25, 1913.] 

 (Plate XOIII.t) 



Index. 



Page 

 Ethology : A new species of Trematode in the body- 

 cavity of Zamenis gemonensis 933 



Geographical Zoology : Southern Europe ; Zamenis 

 gemonensis, a new Trematode from the body- 



cavitj' 933 



Systematic : Lechriorchis inermis, sp. n., fi'om the 



body-cavity oi Zamenis gemonensis 933-936 



On June 10th, 1913, a specimen of a Dark Green Snake 

 (^Zamenis gemonensis), from Southern Europe, died in the Zoolo- 

 gical Society's Gardens, and loose in the body-cavity were a large 

 number of Trematodes which were sent to me for identification. 

 These prove to be a new species of Lechriorchis Stafibi-d closely 

 related to L. validios Kicoll (1911). The habitat is interesting as 

 all the Trematodes of the group which includes Lechriorchis 

 whose habitat is known, occur in the air-passages, pharynx, 

 or anterior part of the oesophagus of their hosts. This appears 

 to be the first time that one of this group has been found 

 occupying the bodj^-cavity. 



An interesting feature in the new species is the absence of 

 spines on the body. The cuticle is quite smooth, unlike any of 

 the other members of the genus. However, in some specimens 

 spines can be seen below the surface of the cuticle, but not 

 reaching to the outside, which seems to indicate a gradual dis- 

 appearance of spines owing to the worm living in the body-cavity 

 of its host, and thei-efore being in no danger of getting swept 

 away as is the case in open passages. In all other ways it agrees 

 closely with the other members of the genus. 



On account of the absence of spines I propose for this new 

 species the name Lechriorchis inermis. 



Lechriorchis inermis, sp. n. (PL XCIII.) 



Length of body 5-10 mm. Oral sucker 0"40-0'60 mm. 

 Ventral sucker 0'60-0*92 mm. Average ratio of oral to ventral 

 sucker 2:3. Prepharynx small, oesophagus the same length as 

 pharynx. Intestinal cpeca reaching a good way beyond testes. 



* Communicated by the Secretaky. 



t For explanation of the Plate see p. 936.. 



