I 



A Nezv Species of Trematode 19 



evident, therefore, that with respect to the presence of an esoph- 

 agus and the lateral extent of the uterus the form which I have 

 described belongs to the new subgenus Cercorchis of which T. 

 Linstowi Stoss. is the type species. 



A study of the comparative table of the species described 

 for the genus Telorchis, with the exception of T. angiisHuii Staff., 

 from the intestine of Chrysemys picta, shows that the cirrus 

 pouch always extends rather far posterior to the acetabulum with 

 its base lying either beneath or very near the ovary and that the 

 genital pore, though slightly removed to the left in most cases, is 

 relatively near the anterior edge of the ventral sucker. It will, 

 furthermore, be noticed that in my specimens and in T. angustiim 

 Staff. (PL I, figs. 2 and 8) the base of the cirrus pouch never lies 

 posterior to the posterior edge of the acetabulum and often lies 

 anterior to its anterior edge, being separated from the ovary by a 

 distance of 0.458 mm and the genital pore is removed to the 

 extreme left and relatively far anterior, so that the cirrus pouch 

 and vagina pass ventral to the left caecum to reach it. 



If Liihe has sufficient grounds for dividing the genus Telorchis 

 into the two subgenera Telorchis and Cercorchis on the presence 

 or absence of an esophagus and the extent of the uterine coils, it 

 seems to me that the marked difference in the position of the 

 cirrus pouch and the genital pore in T. angustmn Staff, and my 

 form, characters which both Looss and Liihe recognize as of 

 generic value, constitutes an important morphological difference 

 and warrants the creation at least of a separate subgenus if not a 

 separate genus. The position of the cirrus pouch, always ante- 

 rior to the acetabulum, being a distinctive character I therefore 

 suggest the name Protenes as an appropriate one for such a sub- 

 genus with Telorchis {Protenes) leptus n. sp. as the type species. 

 This new subgenus would contain the two species T. leptus n. sp. 

 and T. angustum Staff. 



In making a comparative study of the species in the genus 

 Telorchis I noted what appears to me to be an error on the part 

 of Braun, either in his description or in the classification of his 

 species T. plcroticiis and T. bifurcus, for in describing them he 

 says (Braun, 1901 : 13): 



211 



