1902.] NATURAL SCIENCES OF PHILADELPHIA. 115 



EEVISION OF JAPANESE VIVIPARID^, WITH NOTES ON MELANIA 

 AND BITHYNIA. 



BY HENRY A. I'lLSBRY. 



My work on these groups has been based largely upon material 

 supplied by Mr. Y. Hirase, of Kyoto, Japan. 



VIVIPARIDJE. 



The ViviparidcB of Japan, so far as their appearance in the field 

 of literature is concerned, are involved in mind-destroying chaos. 

 This has been due partly to the intrinsic difficulty of the subject, 

 but chiefly to a failure on the part of authors to correctly identify 

 the older Oriental species. Mr. T. Iwakawa,^ of Tokyo, has pub- 

 lished a lucid essay upon the subject, in which the natural divisions 

 or species are for the first time correctly set forth. Owing, how- 

 ever, to the fact that he used the names for the species given by 

 Kobelt" (as there is probably no library in Japan sufficient for the 

 verification of the German author's statements), the nomenclature 

 adopted by Iwakawa requires revision. This implies no criticism 

 of Ihe Japanese ualuralist's admirable essay. The source whence his 

 nomenclature was draAvn was tainted; but the names aside, his grasp 

 of the facts of nature was sound. 



Pseudo -Japanese species. 

 In my opinion, the following species do not occur in Japan : 



Paludina oxytropis Benson, Journal of the Asiatic Society of Bengal, 

 V, 1836, p. 745, type locality Sylhet. Figured in Conchologia 

 Indica, PI. 70, fig. 5, and Conch. Iconica, fig. 9. 



-\- P. pyramidata v. d. Busch in Philippi, Abbildungen, etc., I, p. 

 113. PI. 1, figs. 3, 4 (1844). Type locality, Bengal. 



Paludina inqallsiana Lea, Proc. Acad. Nat. Sci., 1856, p. 110. Fig- 

 ured in Observations on the Genus Uuio, etc., XI, p. 74, PI. 2'Z, 

 fig. 9. Type locality, Siam. Not P. ingallsiana Reeve ! 



I am satisfied that those who will compare authentic specimens of 



' Notes on the Paludina-species of Japan, in Aanotationes Zoologica 

 Japonenses, I, Part 3. pp. 83-93, PI. V, 1897. 



'^ Fauna MoUuscorum Extramarinorum Japonioe, FraukRirt, 1879. 



