4$ PALUDINID^l. 



Subgenus FOSSARULUS, Neumayr. 

 DenJcschrift, 1881, type F. stachei, Neumayr. 



33. Bythinia (Possarulus P) marginata. 



Turbo inarginatus, Chemnitz, Conch.-Cab. I ;=Paludina costigera, BecJc, in 

 Conch.- Cab. II, 1852, pi. VII, figs. 18-19, Bengal, and Con. Indica, pi, 

 151, fig. 10 ; Valvata sulcata, Eyd. Sf Soul., Voy. Bonite, 1852; species 

 of Fossarulus,fide Brusina, Foss. Moll. Dalmatien, fyc., 1874. 



30 Karnul, Conjeveram, & S. India ; coll. W. T. Blanford, Esq., and ex 

 c. Madras Mus. 



30 Ceylon ; coll. E. L. Layard [A. S. B.] and F. Layard, Esqrs. 



subvar. curta. 

 Subvar. curta : long. 6J, diam. 5 J mil. 



A short form, apparently constant, with the spire less pro- 

 duced or exserted. 



Typical, common form : long. 7J, diam. 5J mil. 



6 Bangalore j coll. Gr. Nevill, Esq. 



Subgenus HYDROBIOIDES, nov. 

 Type Bythinia ? turrita, Blanford. 



34. Bythinia (Hydrobioid.es) turrita. 



Fairbankia? (an Bytbinia? ) turrita, W. T. Blanford, Proc. Zool. Soc. 

 1869, KyouJcpoung long. 6$, diam. 3 mil. ; Nevill, J. A. S. ., 1881, pi. 

 VI, fig. 15. 

 1 Kyoukpoung, Burma (type) j coll. Dr. J. Anderson. 



A very remarkable form, apparently allied to the Byth. 

 meneghiniana, Issel, Att. Sc. Torino XXIII, PI. 1, Figs. 12-13, 

 from Persia. 



35. Bythinia (Hydrobioides ?), n. sp. 

 1 Kacbh ; coll. Dr. F. Stoliczka, 



Both this and the preceding may possibly prove to be more 

 nearly allied to Hydrobia than to Bythinia. 



Genus STENOTHYRA, Benson. 



Ann. Mag. XVII, 1856, type S. delta Bs. } for Nematura, Bs., J. A. 

 S. B., F, 1836 (not of Fischer, 1813, Genus Orthopt.} ; belongs to Sub- 

 fern. Hydrobiince, fide Stimpson. 



