4 unidentified Indian Ocean gastropods

[conchylinet]

Hi all,
Here are a few gastropods that I cannot identify, they are all from Indian Ocean.
1 is from southern India and is 29 mm long.
The next three are from Mauritius
2 is 18 mm long.
3 is 17 mm long.
4 is 35 mm long.

<img src="http://www.badongo.com/t/640/3815786" alt="http://www.badongo.com/t/640/3815786" style="border:0" />

<a href="http://www.badongo.net/pic/3815786" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.net/pic/3815786">http://www.badongo.net/pic/3815786</a><!-- m --></a>

Thanks for any help.
Conchylinet.