Help me to identify this busycatum

[luigi_67]

Help please to identify this busycatum from the Gulf of Mexico

<a href="http://img89.imageshack.us/my.php?image=dsc02496mb1.jpg" target="_blank"><img src="http://img89.imageshack.us/img89/7527/dsc02496mb1.th.jpg" alt="http://img89.imageshack.us/img89/7527/dsc02496mb1.th.jpg" style="border:0" /></a>

<a href="http://img89.imageshack.us/my.php?image=dsc02496mb1.jpg" target="_blank"><img src="http://img89.imageshack.us/img89/7527/dsc02496mb1.th.jpg" alt="http://img89.imageshack.us/img89/7527/dsc02496mb1.th.jpg" style="border:0" /></a>
<a href="http://img213.imageshack.us/my.php?image=dsc02498rh1.jpg" target="_blank"><img src="http://img213.imageshack.us/img213/7290/dsc02498rh1.th.jpg" alt="http://img213.imageshack.us/img213/7290/dsc02498rh1.th.jpg" style="border:0" /></a>

[paul monfils]

This is Busycon coarctatum (Sowerby), the "Turnip Whelk".