ii6 



Records of the Indian Museum. 



[Vol. Ill, 



Mr. Bowell informs me that the radula bears a strong resem- 

 blance to that of L. glabra, Miill., but has fewer laterals, the 

 general appearance being more suggestive of the radula of a 

 Planorbis than that of a LimncBa ; the maxilla is also very remark- 



I'lG. 2. — Radula of Limnaa bowelli, Preston. 



able, with a large blunt beak arising from the centre of the semi- 

 circular piece, and he goes so far as to suggest that this last 

 character might possibly form the basis of a new genus. 



Habitat — Te-ring Gompa, in a small hill stream arising from a 

 spring, 14,000 feet (this stream does not freeze in winter) ; also from 

 Mang-tsa, 14,500 feet ; High Hill Gompa, Gyantse valley, in a 

 small hill stream, among inoss and stones, 14,500 feet; and 

 Gj^antse, 13,120 feet. 



Pisidium stewarti, sp. nov, 



vShell sub-trigonal, rather inflated, pale yellowish horn colour, 

 marked with fine concentric lines of growth ; umboes large ; 



anterior lateral teeth somewhat curved 

 with broad groove between, posterior 

 ^ lateral teeth long and straight ; car- 



dinal teeth broad and somewhat pro- 

 jecting in right, strong and sharply 

 -j;- r ^ curved in left valve. 



Long. 

 Lat. 



2*25 mm. 

 3 



Fig. 3. — Pisidium stewarti, 

 Preston. 



Habitat — High Hill Gompa, Gyant- 

 se valley, in a small hill stream, among 

 moss and stones, 14,500 feet (two 

 specimens only). 

 Mr. B. B. Woodward, who very kindly examined this species, 

 tells me that he has seen no recent form resembling it, its nearest 

 ally being a fossil from the tertiary deposits of Belgium which, I 

 understand, still awaits description. 



