34 PALUDINIDA, 
Subfamily BENEDICTIINZ, Dybowski. 
Von Martens and Clessin consider this subfamily as form- 
ing part of the Rissoide. Despite the characters of the oper- 
culum, I can scarcely believe this classification will prove correct. 
Genus BENEDICTIA, Dybowski. 
Mém, Ac. Petersb. XXII, 1875, type B. fragilis, Dyb. 
1. Benedictia baikalensis. 
Paludina Baikalensis, Gerstfeldt, Mém. Ac, Petersb. IX, 1859, Lake Baikal. 
1 Lake Baikal; ex Mr. R. Damon. 
Subfamily BYTHINIINZ, Troschel (emend.). 
Considered by Stimpson and Clessin as a subfamily of the 
Rissoidee. 
Genus BYTHINIA, Leach, Ms. 
Gray, Medic. Repos. XV, 1821 Lsine descr]; = Bythinia, Risso, 1826 : 
fide Clessin, “ Bythinia,’? Gray, Philos. Mag. Vol. 63, p. 274, type Helix 
tentaculata, Lin. ; fide Martens, “ Bithinia” of Fam. Paludinide. 
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.-bot. Ges. Wien, 1862; Con. 
Indica, pl. 38, figs. 1 and 4. 
30 Calcutta, Hazrapur, Barrackpore, and Réniganj; coll, Dr. F, Stoliczka 
and G. Nevill, Esq. 
30 Assam; ex c. Dr. T. Oldham. 
20 Bengal; ex c. As. Soc. Bengal [? typical]. 
9 Sémbhdr Lake, and Sind; coll. Dr. F. Stoliczka. 
4 Patna and Rurki; coll. J. Wood-Mason, Esq., and Colonel G, B. Main- 
waring. 
30 Ferozpur; coll. Captain R. C. Temple. 
subvar. carinulata. 
1 Assam; exc. Dr. T. Oldham. 
A remarkably deformed, abnormal specimen. 
subvar. gigantea. 
1 Calcutta; coll, Dr. F. Stoliczka, 
