#4 looks like a freshwater shell, planorbidae.
http://www.flmnh.ufl.edu/natsci/malacology/fl-snail/snails5.htm#Planorbidae
shells wrote:
> Hello. This is my first contact with you.
>
> I´m a shell collector from Buenos Aires (Argentina).
>
> I have some shells without classification, and I'd like you help me.
>
> I put a picture of them in
> http://ar.geocities.com/southernshells/desconocidas.html .
>
> Thank you very much.
>
> Alejandro Rossi
>
--
Steve _
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"I have opinions of my own -- strong opinions -- but I don't always
agree with them."
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