34 PALUDINID^. 



Subfamily BJENEDIOTIIN^, Dybowski. 



Von Martens and Clessin consider this subfamily as form- 

 ing part of the Bis so idee. Despite the characters of the oper- 

 culum, I can scarcely believe this classification will prove correct. 



Genus BENEDICTIA, BylowsU. 

 M^m. Ac. Fetersh. XXII, 1875, type B.fragilis, Byh, 



1. Benedictia baikalensis. 



Paludina Baikalensis, Gerstfeldt, Mem, Ac. Petersl. IX, 1859, Lake Baikal. 

 1 Lake Baikal ; ex Mr. R. Damon. 



Subfamily JBYTHINIIN^, Troschel (emend.). 



Considered by Stimpson and Clessin as a subfamily of the 

 Missoidce, 



Genus BYTHINIA, Leach, Ms. 



Gray, Medic. Bepos. XV, 1821 [_sine descr.'] ; = Bythinia, Bisso, 1826 ; 

 fide Clessin, " Bythinia," Gray, PUlos. Mag. Vol. 63, p. 274, type Helix 

 tentaculata, Lin. ; fide Martens, " BitUnia'' of Fam. Paludinidce. 



1. Bythinia cerameopoma. 



Paludina sp. ?, Benson, Gleanings Science, Calcutta, Vol. I, p. 363, and 

 Vol. II, 1830, p. 125, as Paludina cerameopoma ; also J. A. S. B., 1855 ; 

 = B. ceranospatana, Frauenfeld, Ver. zool.-hot. Ges, Wien, 1862; Con. 

 Indica, pi. 38, figs. 1 and 4. 



30 Calcutta, Hazrapur, Barrackpore, and Raniganj ; coll. Dr. F. Stoliczka 



and G. Nevill, Esq. 

 30 Assam ; ex c. Dr. T. Oldham. 

 20 Bengal; ex c. As. Soc. Bengal [? typical]. 

 9 Sambbar Lake, and Sind ; coll. Dr. F. Stoliczka. 



4 Patna and Rurki ; coll. J. Wood-Mason, Esq., and Colonel G. B, Main- 

 waring. 

 SO Ferozpur J coll. Captain R. C. Temple. 



subvar. carinulata. 



1 Assam ; ex c. Dr. T. Oldham. 



A remarkably deformed, abnormal specimen.. 



subvar. gigantea. 

 1 Calcutta ; coll. Dr. F. Stoliczka. 



