Shell-inlaid paintings

[sonia]

Hi. I am working on my dissertation about New Spanish shell-inlaid paintings, made from 1650 to 1750. No one knows what kind of shells were used and the fact they are cut, inlaid and painted makes it very difficult to identify them. I have tried to find a research group able to identify them. Any suggestions?
Here you can find some images of these paintings:

<a href="http://www.analesiie.unam.mx/pdf/92_107-153.pdf" target="_blank"><!-- m --><a class="postlink" href="http://www.analesiie.unam.mx/pdf/92_107-153.pdf">http://www.analesiie.unam.mx/pdf/92_107-153.pdf</a><!-- m --></a>