46 Records of the Indian Museum. [Voi,. XIX^ 1920.] 



The only known species is Blanford's Bithynia evezardi ' from 

 Mahableshwar in the Satara district and Khaudalla in the Poona 

 district of the Bombay Presidency. Both places are situated at 

 moderate altitudes in the Western Ghats and the range of the 

 genus seems to be coterminous with that of the remarkable Lit- 

 torinid genus Cremnoconchus , Blanford, which lives in the spray 

 of waterfalls. Nothing is known of the habits of Sataria and very 

 few specimens have been collected. 



Subfamily MYSORELLINAE , nov. 

 Genus Mysorella, Godwin-Austen (1919). 



1919. Mysoria, Godwin-Austen, Rec. Ind. Miis. XVI, p. 211. 



1919. Mysore/la, id. ibid., p. 431. 



1919. Mysoria, Annandale, Rec. Geol. Surv. hid. L, p. 211. 



In describing this genus (under the name Mysoria) Col. 

 Godwin-Austen drew attention to the remarkable difference between 

 its radula and that of Bithynia and suggested that they might be 

 placed in different families. The external anatomy^ however, is 

 so similar in the two genera that this course seems unnecessary, 

 and the recognition of a special subfamily will meet the case, 

 unless some conspicuous difference can be found in the internal 

 anatom}'. The original name, which was preoccupied in Insecta, 

 was subsequently changed to Mysorella. 



Typk-species, Paludina costigera, Kiister. 



Two local races are distinguished, the typical form from the 

 southern part of the Madras Presidency and Ce^don and the var. 

 curta, Nevill* from the Mysore plateau. The former is a mollusc 

 of the plains and is common in the neighbourhood of the town of 

 Madras, while the latter has been found only at an elevation of 

 about 3,000 feet above sea-level. 



It is noteworthy that while the shell has a ver}^ close external 

 resemblance to that of the I^ittorinid Cremnoconchus syhadrensis 

 (Bfd.) and both genera are highly modified, their habits are quite 

 unlike. Cremnoconchus lives on vertical rocks kept wet by the 

 spray of waterfalls, while Mysorella frequents the edge of ponds 

 and flooded rice-fields. In the latter it burrows into the mud 

 when desiccation takes place, and it is completely aquatic. The 

 shorter-shelled form {curta) is found among stones, while the forma 

 typica usually frequents a muddy bottom. 



1 See Blanford, Joiirn. As. Soc. Bengal XLIX (2), p. 220; Nevill, ibid., 

 XL.X (2), p. 157, pi. vi, fig. 13. 



2 Nevill, Hand List Moll. Ind. Mas. II, p. 42 (1884 j. 



