please help!!! i know nothing about seashells

[chastidyllaws]

i have quite a few of these shells, please help me identify and place a value on if any. thanks for putting up with me.<a href="http://www.badongo.com/pic/1351130" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/1351130">http://www.badongo.com/pic/1351130</a><!-- m --></a> <a href="http://www.badongo.com/pic/1351140" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/1351140">http://www.badongo.com/pic/1351140</a><!-- m --></a>