1 838.] Land and Fresh-water Shells of the Himalaya. 21 1 



tUre 82.5, and of brine sp. gr. 1091, temperature 81°. Result, sp. gr. 

 1152.5, temperature 82.2 and no effervescence. 



3rd Experiment. — Same quantities of brine sp. gr. 1216, tempera- 

 ture 82.5, and sp. gr. 1135, temperature 81.6. Result, sp. gr. 1174.3, 

 temperature 82.1 and no effervescence, nor -any increase of tempera* 

 ture after remaining some hours in the glass. 



Being therefore quite unable to offer any explanation of the cause of 

 the remarkable heat observed in my brine reservoirs, I can only promise 

 to register the temperature from time to time when they are filled again 

 in the hope that materials may thus be furnished to some scientific friend 

 more capable of solving the interesting problem. If it should be disco- 

 vered that a slow fermentation arising from the mixture of brine of dif- 

 ferent densities in large masses is the cause of this heat, it would seem 

 to be accelerated by agitation, for the water raised by the pumps was 

 always warmer than that which the probe brought up from the same 

 depth ; and, except at the first trial at Narainpore, always hotter than 

 the maximum given by the probe. 



VI. — On the Land and Fresh-water Shells of the Western Himalaya. 

 By Lieut. T. Hutton, 37th Regt. N. L and W. H. Benson, 

 Esq., C. S. 



The following catalogue chiefly refers to shells which I have lately 

 discovered, almost all inhabiting the western portion of the Himalaya in 

 the neighbourhood of Simla, and extending upwards from Monimajra 

 at the extreme verge of the hills, to the Burenda Pass on the Snowy 

 range. In the description of the various species, I have availed myself 

 of the valuable assistance of Mr. Benson, C. S. whose extensive collec- 

 tion of terrestrial and fluviatile shells from all parts of the world, and 

 whose greater experience in this branch of natural history, have enabled 

 him to do more justice to the subject, than I could have done without 

 assistance. In order, however, that each may in some measure stand 

 responsible for his contributions, an initial letter will be found affixed. 



Although most of the shells belong to the hills, a few were collected 



on the route from Neemuch in the cold season of 1835-6 « The most 



interesting of these acquisitions is an unique specimen of an < Ancylus 

 the first of this Patelliform genus yet discovered in India, if not in 

 Asia*." It occurred adhering to a dead specimen of Paludina Benga- 

 lensisy in the Kali Nuddi at Bolund Shehr. 



* Benson. 



