Forums SEASHELL-COLLECTOR

Could you to help me to identificate this seashels?
All shells are from Costa Rica, from Manuel Antonio (pacific coast) and all was collected last summer. Thank you.
Rafa.
<a href="http://www.badongo.com/pic/2775019" target="_blank"><!-- m --><a class="postlink" href="http://www.badongo.com/pic/2775019">http://www.badongo.com/pic/2775019</a><!-- m --></a>

1. Looks like an Acanthina, but doesn't seem to match any of the common Panamic species?

2. Nerita funiculata  Menke,1851

3. Nerita scabricosta  Lamarck,1822

4. Triumphis distorta  (Wood, 1828)

5. Thais melones  (Duclos, 1832)