6 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



metrana the vitellaria do not extend anterior to the acetabulum. 

 The uterus is transversely coiled and narrow. The intestinal ceca 

 do not extend to the posterior tip of the body. If the original 

 diagnosis of Looss (1899) is accepted, the distinction between the 

 two genera is even more marked. 



The genus Opisthiocjlijfhe Looss also exhibits an aberrant mor- 

 phology, in that the uterus does not pass between the testes. In this 

 genus, however, the uterus is confined to the space between the 

 acetabulum and the middle of the anterior testis. The testes are 

 usually oblique but may be tandem, and they are usually located 

 well back in the posterior portion of the body. Typically, the 

 cirrus pouch is entirely, or mostly, anterior to the acetabulum. The 

 vitellaria extend to the posterior tip of the body. 



Concerning the separation of the testes by the uterus in the genus 

 Mediorima NicoU, 1914:, no definite statement can be made, since this 

 genus is inadequately described. Travassos includes it in the 

 Plagiorchiinae. Sum wait (1926) expresses the opinion that the 

 establishment of the genus Mediorima seems unnecessai-y. Mediorima 

 appears to be so closely related to Zeugorchis Stafford, 1905, and 

 LechrioTckis Stafford, 1905, both of which belong to the subfamily 

 Reniferinae Pratt, 1902, that its inclusion in the Plagiorchiinae ap- 

 pears dubious. 



BIBLIOGRAPHY 

 Baee, Jean G. 



1924. Description of a new genus of Lepodermatidae (Trematoda) with 

 a systematic essay on the family, rarasitology, vol. 16, no. 1, pp. 

 22-31, iigs. 1-2, Jan. 



BlIALERAO, G. D. 



1926. On the trematode parasites of a water-snake, Troi>uJo)wtus pi-icator. 



Parasitology, vol. 18, no. 1, pp. 4r-13, figs. 1-2, Jan. 

 1926. On the treniarodes of the digestive tract of a common Indian frog, 



Rana tigr'rna, with a description of Centrinntus peniudelphi n. g., 



n. sp. Parasitology, vol. 18, no. 2, pp. 154-159, figs. 1-lA, June. 

 CORT, W. W. 



1919. A new distome from Rana aurora. Univ. California Publ. Zool., vol. 



19, no. 8. pp. 283-298, tigs. 1-5, Nov. 15. 

 Looss, A. 



1894. Die Distomen xmserer Fische und Frosclie. Neue Untersuchungen 



iiber Bau und Entwickelung des Distonjonkorpers. 296 pp., 9 pis., 



192 figs. Stuttgart. (Biblioth. zool., Heft 16.) 

 1899. Weitere Beitriige zur Kcuutniss der Trematoden-Fauua Aegyptens, 



zugleich Yersuch eiuer natiirliehen Gliederung des Genus Dis- 



toDiiirn Retzius. Zool. Jahrb., Alit. f. Syst., vol 12, nos. 5-6, pp. 



521-784, figs, a-b, pis. 24-32, figs. 1-90, Dec. 28. 

 19U2. Ueber neue und hekannte Treniatnden aus Seeschildkroten. Nebst 



Enuterungen zur Systematik und Nomenclatur. Zool, Jahrb., 



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