There are also shells that are carried by hermit crabs from deeper water.

Allen Aigen  NYC
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On Fri, 24 Mar 2006 14:50:19 -0500 [log in to unmask] writes:
> O.K., Here's one thought! Unless they are very light and/or pelagic,
> dead shells would have to come from pretty close. Weight would cause
> them to be pretty close to the bottom. Storms could send unusual
> material up on beaches. But I betcha most of what you find dead on a
> beach would be live there at some time.
>      But what do I know.
>          Art
>
>
> --
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> ---- ronald noseworthy <[log in to unmask]> wrote:
> > Hi, everyone!
> >
> > While I was preparing a database on the mollusks of Jeju
> > Island, I realized that I had a lot of records of dead
> > material from the many beaches on this island.
> >
> > What is the relationship between the dead shells found on
> > beaches and the living populations of those species?  Would
> > the dead material be an accurate record of the living
> > mollusk fauna of the adjacent area?  What exceptions would
> > there be?
> >
> > I have searched the Conch-L archives but found little on
> > this subject.  Any assistance you can offer would be greatly
> > appreciated.
> >
> > All the best from Korea!
> > Ron Noseworthy
> >
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