1922.] B. Prashad : Kumaon Lakes. 17 



discuss the generic position here, as, in view of Robson's ' recent 

 remarks, I propose revising all the Indian Hydrobiidae when 

 more material is available. 



Digoniostoma (?) pulchella (Benson). 

 1836. Falndina pulchella, Benson, Journ. As. Soc. Bengal V, p. 476. 



Large series of specimens of this species were collected by 

 us in a pond along the roadside near Naukuchia Tal at an alti- 

 tude of over 4000 ft., together with specimens of L. luteola. 



Family VIVIPARIDAE. 



Genus Vivipara Lam. . 



In the Tal area this genus is represented by a race of the 

 common Indo-Gangetic species V. bengalensis. Even this race 

 was found to have a restricted distribution, as specimens were 

 found only in Naini Tal and Khurpa Tal. 



Vivipara bengalensis race mandiensis Kobelt. 



1921. Vivipara bengalensis race mandiensis, Annandale, Rec. hid.' 

 Mus. XXII, p. 271. 



I have nothing to add to Annandale's detailed account of 

 this and the allied races, beyond recording the occurrence of this 

 race at such high altitudes as that of Naini Tal and Khurpa Tal. 



Family CYRKNIDAE. 

 Genus Sphaerium Scopoli. 

 i«)2i. Sphaerium, Prashad, Rec. hid. Mus. XXll, p. 614. 

 I have nothing to add to my recent account of this genus and 

 of the widely distributed Indian species, S. indicum Desh., speci- 

 mens of which were found by us in Damianti Tal. 



' Ann'. Mag. Nat. Hist. (9) VIII, pp. 401-413 (i9 2 ')« 



