request shell identification

[kakaninr]

Dear Paul Monfils,
I attach with this a clear picture of the snail recovered from 71 m depth in the lake bed. Also attached a picture of another shell which was recovered at about 79 m depth in the same lake bed. Kindly see if they can be identified accurately in terms of their species name, and habitat.
The shells are uploaded at:
<a href="http://www.badongo.com/pic/10226571" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/10226571">http://www.badongo.com/pic/10226571</a><!-- m --></a>
<a href="http://www.badongo.com/pic/10226572" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/10226572">http://www.badongo.com/pic/10226572</a><!-- m --></a>
thanking you
Sincerely
Kakaninr  <span class="petit">--Last edited by Paul Monfils on 2010-08-13 17:36:02 --</span>