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Rh Hygromia rufescens (Penn.) Acanthinula aculeata (Müll.) lamellata (Jeff.) Ashton Clinton Vallonia pulchella (Mull.) Helicigona lapicida (Linn.) arbustorum (Linn.) Helix aspersa, Müll. pomatia, Linn. Great Marlow ; Hambledon nemoralis, Linn. hortensis, Müll.* Buliminus obscurus (Müll.) Cochicopa lubrica (Müll.) Azeca tridens (Pult.) Amersham ; Fawley Woods Cæcilianella acicula (Müll.)* Pupa secale, Drap. cylindracea (Da C.)* muscorum (Linn.) Sphyradium edentulum (Drap.)* Vertigo pygnuea (Drap.) Balea perversa (Linn.)* Clausilia laminata (Mont.)* bidentata (Ström.) Succinea putris (Linn.) elegans, Risso.*

Carycbium minimum. Müll. Ancylus fluviatilis, Müll. Velletia lacustris (Linn.)* Limncea auricularia (Linn.) pereger (Müll.) palustris (Müll.)* truncatula (Müll.) stagnalis (Linn.) Amphipeplea glutinosa (Müll.) Buckingham Taplow Planorbis corneus (Linn.) albus, Müll. nautileus (Linn.) carinatus, Müll. marginatus, Drap. vortex (Linn.) spirorbis, Müll.* contortus (Linn.) fontanus (Lightf.) lineatus (Walker) Physa fontinalis (Linn.) hypnorum (Linn.)*

Bitbynia tentaculata (Linn.) leachii (Shepp.)* Vivipara contecta (Millett) Valvata piscinalis (Müll.) cristata, Müll. Pematias elegans (Müll.) Halton Aclcula lineata (Drap.) Fawley Woods Neritina fluviatilis (Linn.)

Dreissensia polymorpha (Pall.)* Unio pictorum (Linn.) tumidus, Retz. Anodonta cygnæa (Linn.) Sphærium rivicola (Leach) corneum (Linn.) Sphærium lacustre (Müll.) Pisidium amnicum (Müull.) pusillum (Gmel.) nitidum, Jenyns * fontinale (Drap.) The variety P. henslowianum occurs in the Thames