>In my opinion it is also very important to include coordinates on the shell
>labels for plotting grit maps of the distribution of the species and
>secondly for the future (locality names often changes).

Where possible I include GPS data (to thousandths of a degree) if out
on the marine lab boat "Munida" or when it is provided to me by the
collector(s). Otherwise, with selfcollected shells, I use the
1:50,000 topomap gridref, to 8 digits where map accuracy allows.
--
Andrew Grebneff
165 Evans St, Dunedin 9001, New Zealand
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Seashell, Macintosh, VW/Toyota van nut