452 Descripfwns of Land Shells 



but where they might have been left by stranded icebergSj. 

 favors this conclusion. 



5. The fact that a large part of the fragments detached 

 from glaciers are of small size, and that these small fragments 

 of icebergs or glaciers are dissolved and broken to pieces, at 

 no great distance from the parent glacier, together with the 

 fact that fragments of rock, although often seen near the 

 source, are rarely seen at a distance, lead to the inference, 

 that the same causes limited the transportation of the bowl- 

 ders and larger fragments of the drift, to within the compara- 

 tively small distance from the parent rocks at which they now 

 occur. 



ART. XXXVIII. — DESCRIPTIONS OF LAND SHELLS FROM THE 

 PROVL\CE OF TAVOY, IN BRITISH BURMAH. By Augustus A. 

 Gould, M. D. Read September 6, 1843. 



In correspondence with the Rev. Francis Mason, mission- 

 ary of the Baptist Board for Foreign Missions at Tavoy, one 

 of the provinces of British Burmah, 1 expressed a wish that he 

 would send me some of the shells he might meet with in his 

 journeyings. He very promptly interested some of the natives 

 in the undertaking, and, by their assistance, soon forwarded 

 me a collection, which 1 propose to notice in the present 

 paper. 



The province of Tavoy is situated between 13° and 14° 

 S(y north latitude, and between the Bay of Bengal on the 

 west, and the kingdom of Siam on the east. It is traversed 

 by a range of mountains, from 500 to 1500 feet high, and 

 is well watered by large rivers. As it is out of the track of 

 commercial enterprise, it has been little explored by Euro- 

 peans. 



The collection contained thirty-five species, out of which I 

 have, as yet, been able to identify only four or five as described 



