On Monday, I spent the day with Richard Preece at Paxton surveying some of the molluscs that live there. We only managed two areas but from that Richard identified 31 species. The Caddis Fly that inhabited this case obviously had a liking for snails' shells - many might still have been alive when added and carried around. Some of the snails had very interesting origins such as image 4, a very small snail with a very long name Potamopyrgus antipodarum an immigrant all the way from New Zealand, and a bivalve (no.5) spread here from Asia. The grid is 5mm so you can see how small some of these were.
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