28 Perry C. Holt and Ann M. Weigl 



always at least as long as the median ones and usually longer. There is a 

 possibility that the dental formula may vary slightly, but it is constant for 

 all the specimens examined in which it could be determined. 



Affinities'. — In the true sense of the word, until there is a monographic 

 revision of the genus, the affinities of X. bashaviae cannot be determined. 

 Xironodrilus formosus has a small spermiducal gland without the expanded 

 lumen of X bashaviae and lacks an ejaculatory duct. The dental formulas 

 also differ: that of X. formosus varies from 4/3 to 6/5 (Holt 1951). 

 Xironodrilus pulcherrimus (Moore 1894) has a dental formula of 3/3 with the 

 middle tooth shorter than the lateral ones and its spermiducal gland is 

 slender and lacks the expanded lumen of X. bashaviae. In addition, 

 specimens of X '. pulcherrimus (Moore 1894; Holt 1951) are somewhat larger 

 than any of those of X. bashaviae we have measured. Xironodrilus appalachius 

 Goodnight 1943 also has a dental formula of 3/3 with the middle tooth 

 longer than the lateral ones and a reproductive system similar to that of X. 

 pulcherrimus. Specimens of X. appalachius are of approximately the same size 

 as those of X. bashaviae (Holt 1951). Xironodrilus dentatus Goodnight 1940 is 

 characterized by a dental formula of 4/5, 5/5 or 5/4 and is recorded from 

 Oklahoma and Missouri. The jaw shape and other features of this species 

 also differ from X. bashaviae (Holt, unpub. data). 



Host: — Cambarus bartonu (Fabricius 1798). 



Distribution: — The type-locality, two sites in Bashavia Creek and one in 

 Fries Creek, are all part of the upper drainage of the Yadkin River in For- 

 syth County, North Carolina. 



Material examined: — The type-series and 38 other specimens mounted en- 

 tire and portions of several serially sectioned animals. 



LITERATURE CITED 



Ellis, Max M. 1918. Branchiobdellid worms (Annelida) from Michigan crayfish. 



Trans. Am. Microsc. Soc. 37(1):49-51. 

 1919. Branchiobdellid worms in the collections of the United States 



National Museum, with descriptions of new genera and species. Proc. U.S. 



Natl Mus. 55:241-265, pis. 10-13. 

 Franzen, A. 1963. Notes on the histology of Xironogiton instabilia (Moore, 1893) 



(Family Branchiobdellidae) with special reference to the muscle cells. Zool. 



Bidr. Upps. 35:369-384, pi. I-IV. 

 Goodnight, Clarence J. 1940. The Branchiobdellidae of North American 



crayfishes. 111. Biol. Monogr. 77(3): 1-75. 

 1943. Report on a collection of branchiobdellids. J. Parasitol. 29:100- 



102. 



