I92I.] N. Annandale & B. Prashad : Gastropods. 5 



The type-species of the genus is A. porata, Say, from Massa- 

 chusetts, United States of America. 



Subgenus Alocinma, Annandale and Prashad (1919). 



1919. Alocinma (subgenus of Amnicola), Annandale anil Prashad, 



Rec. Ind. Mus. XVIII, pp. 23, 24. 



1920. Alocinma, Annandale, ibid., XIX, p. 43. 



This subgenus was recently established for A. sist'anica and 

 its Indian and Mesopotamian allies. Its distinguishing characters 

 are noted in the two papers cited above. 



The type-species of Alocinma is .4 . s/stowu"a, Annandale and 

 Prashad. 



Genus Sataria, Annandale (1920). 

 1920. Sataria, Annandale, Rec. Ind. Mus. XIX, pp. .15, 46. 



The genus Sataria was recently established for the species 

 described by Blanford as Bithynia cverzardi from Mahableshwar in 

 the Satara district and from Khandalla in the Poona district of the 

 Bombay Presidency. The shell is almost trochiform, ornamented 

 with spiral incised lines, and is shallowly but openly umbilicate. 

 The operculum is calcareous and externally marked with strong 

 concentric ridges. The radula resembles that of Bithynia, but has 

 blunter denticulations and there is a quadrate process on the disc 

 of the central tooth. 



5. everzardi is the only known species of the genus. 



Subfamily LITHOGLYPHINAE. 



The shells of this subfamily are among the very few fresh- 

 water forms that have the main axis of the spire not quite in the 

 same straight line as that of the body- whorl. This, with their 

 globose outline and plate-like columellar callus, gives them an 

 almost neritiniform appearance. The true diagnostic features of 

 the subfamily are, however, to be found in the structure of the 

 operculum (see key) and possibly in that of the male organ, about 

 which there is some conflict of evidence ; their shell-characters are 

 closely analogous to those of the genus Paranerita, which we see 

 no reason to separate from the Bithyniinae. 



Genus Lithoglyphus, Miihlfeldt (1821). 



1821. Litlioglyphus, Miihlfeldt in Sturm's Fauna {fide Kobelt). 

 1892. Lithoglyphus, Kobelt, op. cit., p. 28. 



Lithoglyphns martabanensis, the only species known from the 

 Indian Empire, seems to be, so far as can be judged from the shell 

 only, a normal species of the genus, to which the Chinese L. lili- 

 ptitanus, Gredler, certainly belongs. 



The type-species of the genus is L. eburneus, Mag. v. Miihl- 

 feldt. 



