26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



tive. The flukes killed by the latter method always possessed ace- 

 tabula more than 2.5 times larger than the oral sucker, while many 

 of those killed by the former method possessed relatively smaller 

 acetabula. I was unable to distinguish any differences in the male 

 genital system in my material, but as the ejaculatory pouch has not 

 been mentioned in earlier descriptions, it can not be regarded as cer- 

 tainly absent. Therefore, it seems to me that Gorgodera circava is 

 a synonym of G. amplicava. 



Family TELORCHIIDAE Stunkard, 1924 



Stunkard included two subfamilies, the Telorchiinae and the 

 Auridistominae, under the family Telorchiidae, but the relationship 

 of the two to each other and to the distomes as a whole is very un- 

 certain. Various authorities have suggested that they are related 

 to the Bunoderidae, the Plagiorchiidae, the Opisthorchiidae, or the 

 Echinostomatoidea. I feel that until more is known concerning the 

 life history of the trematodes included in this group, it will be im- 

 possible to settle their phylogenetic relations. 



Subfamily Telorchiinae Looss, 1899 



Genus CERCORCHIS Luhe, 1900 



This genus has been treated as a synonym of Telorchis by most 

 writers, especially since Stunkard (1916) showed that the characters 

 used by Liilie to separate them were unreliable. Recently Perkins 

 (1929) has shown that the two genera are distinct, and that Liihe's 

 characterization of them had been inadequate. Consequently it be- 

 comes necessary to transfer all the North American species of Telor- 

 chis to Cercorchis. These include many species that are parasitic in 

 turtles, and a few that parasitize snakes or amphibians. 



CERCORCHIS TEXANUS, new species 



Plate 2, Figure 6 



SpecifiG diagnosis. — Cercorchis : The fully matured specimens in 

 my material are 6.6 to 8.24 mm long and 0.48 to 0.7 mm wide. The 

 greatest width is usually in the region of the acetabulum. The 

 spines are very thick in the cephalic region, but caudad they become 

 progressively thinner until they quite disappear near the testes. The 

 oral sucker is 0.12 to 0.16 mm in diameter; the acetabulum is the 

 same size and is usually about one-sixth of the body length from 

 the anterior end. The prepharynx is very short, being less than 

 100/A long. The pharynx is circular; and its diameter is 0.9 to 1.1 

 mm. The esophagus is moderately long, measuring 0.13 to 0.2 mm 



