MOLLUSCA. (Molluscs)
	Species not observed since 2000 are marked*
	GASTROPODA.(Slugs and Snails)
	HYDROBIIDAE:
	Jenkin's Spire Snail.	Potamopyrgus antipodarum (Gray, 1840)
	In main stream.
	LYMNAEIDAE:
	Great Pond Snail.	Lymnaea stagnalis (Linnaeus, 1758)
	Common in Newt Pond (A).
	Wandering Pond Snail.	Lymnaea peregar (Müller, 1774)
	Common in Newt Pond (A).
	PLANORBIDAE:
	Great Ramshorn.*	Bathyomphalus corneus (Linnaeus, 1758)
	Newt Pond (A) (probably introduced). Not seen recently.
	Whirlpool Ramshorn.	Anisus vortex (Linnaeus, 1758)
	Occasionally common in Newt Pond (A).
	SUCCINEIDAE:
	Large Amber Snail.	Succinea putris (Linnaeus, 1758)
	Pfeiffer's Amber Snail.	Oxyloma pfeifferi (Rossmässler, 1835)
	DISCIDAE:
	Rounded Snail.	Discus rotundatus (Müller, 1774)
	Generally present in leaf/reed litter piles.
	ARIONIDAE:
	Great Black Slug.	Arion ater agg. (Linnaeus, 1758)
	Occasionally noted in Area V.
	LIMACIDAE:
	Great Grey Slug.	Limax maximus Linnaeus, 1758
	On Sycamore (Acer), Area II.
	ZONITIDAE:
	Crystal Snail.*	Vitrea crystallina (Müller, 1774)
	Rayed Glass Snail.*	Nesovitrea hammonis (Ström, 1765)
	Smooth Glass Snail.*	Aegopinella nitidula (Draparnaud, 1805)
	Shiny Glass Snail.*	Zonitoides nitidus (Müller, 1774)
	EUCONULIDAE:
	Tawny Glass Snail.*	Euconulus fulvus (Müller, 1774)
	Glass Snail.*	Euconulus alderi (Gray, 1840)
	CLAUSILIIDAE:
	Two-toothed Door Snail.	Clausila bidentata (Ström, 1765)
	In wooded areas to the south and west of the Commons.
	HELICIDAE:
	Ashford's Hairy Snail.	Ashfordia granulata (Alder, 1830)
	Occasionally observed.
	Black-lipped Hedge Snail.	Cepaea nemoralis (Linnaeus, 1758)
	Common.
	Common Snail.	Helix aspersa (Müller, 1774)
	Occasional, usually near habitation.
	BIVALVIA.(Bivalves)
	SPHAERIIDAE:
	Orb Mussel.	Sphaerium corneum (Linnaeus, 1758)
	In Newt Pond (A) part of Caddis larvae case (2003). Empty shell 2005.