24 Franklin D. Barker and George W. Covey 



I have been able to identify and describe all of these structures 

 in the trematode from the intestine of Chrysemys marginata. 



In view of Stafiford's meager description and his indefinite 

 drawing and the differences already noted between T. angustum 

 and the form which I have described, I am of the opinion that the 

 two are not the same species and that the form found in Chry- 

 semys marginata is a new species. If subsequent comparative 

 study of the two forms bears out my conclusion I would suggest 

 the name Telorchis (Protenes) leptus, as an appropriate one for 

 the trematode which I have described as found in Chrysemys 

 marginata. 



DIAGNOSTIC CHARACTERS OF THE GENUS TELORCHIS 



The following is a summary of the characters of the genus 

 Telorchis based on the description of Looss (1899: 566), Liihe 

 (1899: 524) and the present investigation. 



Body elongate, more or less reduced toward posterior end, flat; skin 

 armed or unarmed ; testes, at posterior end of body, one behind the other 

 in median line; cirrus pouch long, usually more or less coiled, contains 

 seminal vesicle in posterior end, lies either wholly anterior to acetabulum, 

 or extends posterior to it to region of ovary; genital pore dorsal or ven- 

 tral, anterior to acetabulum and more or less removed to left of mid-line; 

 ovary anterior to middle of body, in mid-line or slightly to one side, smaller 

 than testes; yolk reservoir, receptaculum seminis, shell gland and Laurer's 

 canal present in region of ovary ; uterus long, coiled, filling space between 

 ovary and testis and between caeca of intestine; oral sucker' usually a little 

 smaller than acetabulum ; pharynx present ; prepharynx present or absent ; 

 esophagus present or absent; long intestinal caeca extend almost to pos- 

 terior end; yolk glands fill lateral areas from region of ovary to region of 

 anterior testis ; excretory system has a median dorsal vesicle which 

 branches, at a point just posterior to the ovary into a Y-shape, and which 

 opens through the excretory pore at the extreme posterior end. 



Habitat. — Intestine of turtles, snakes and lizards. 



KEY TO SUBGENERA OF GENUS TELORCHIS 



I. Cirrus pouch extends posterior to acetabulum II 



A. Cirrus pouch does not extend posterior to acetabulum. Pro- 

 tenes n. s. g. 

 Type species. — telorchis leptus n. sp. Barker and Covey. 

 II. Esophagus absent Ill 



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