14 Examination of Minerals from Ava. [Jan. 



I am preparing a description of the Carocolla above-mentioned, the 

 animal of which, as far as this particular species is concerned, fully 

 justifies Lamarck's separation of the genus from Helix. Since writing 

 the above account, I have discovered a new genus of amphibious 

 shells, inhabiting the tract between high and low water mark in the 

 river Hooghly, the animal of which, bearing only two tentacula, differs 

 alike from the fresh water and land genera, which are similarly circum- 

 stanced in having the eyes (or, more properly speaking, the percipient 

 points) on the summits of the tentacula, as in the quadri-tentaculated 

 species, instead of at their base. The discovery of two new genera, 

 and of as many new species in Bengal, in the course of a hurried trip 

 down the country, and in an unfavorable season, leads us to the 

 conclusion, that many other novelties in terrestrial and fluviatile 

 conchology remain to be discovered in that province, and in the 

 neighbouring unexplored territories of Arracan and Ava. It is 

 to be regretted, that a species of Cyclostoma recently discovered 

 alive at Tenasserim, and described in the Zoological Journal, as 

 C. Perdix, was not described before death, as the keel, with which 

 the shell is provided, gives reason to conjecture, that the animal 

 differs in some respects from the animals of other species which have 

 been described. Persons not conversant with conchology would do 

 well to preserve the shells, with the animals alive, in a small box, with 

 cotton around them, in which state land-shells may be preserved for 

 several months, and when excited by moisture, they will make their 

 appearance, and afford instruction to observers competent to note 

 their characters, to whom they may be submitted. I have kept num- 

 bers of species of Bulimus alive for nine months, without any of them 

 manifesting an inclination to come forth : and I have now by me in 

 good health the species of Cyclostoma and Caracolla, which I collected 

 in the localities mentioned in the early part of this paper. 



Calcutta, Jan. 17, 1832. 



V. — Examination of Minerals from Ava. By J. Prinsep, Sec. Ph. CI. 



£Read 16th Nov.;] 



Major H. Burney has favored us with a further supply of minerals 

 from Ava, proving that country to be as promising a field for varieties 

 of the earthy minerals as it has already turned out prolific in metallic 

 ores : among the present series may be enumerated ; 



1. — Asbestos, from the crevice of a rock among the hills of Tsa-gain ; 

 fine silky white Amianthus, crystallized on silicious dolomite, as it 



