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 MOLLUSCS Vertigo minutissima, Hartm. Maidstone (scarce) — substriata (JefF.). Westerham ; rejecta- menta of river Stour — pygmtea (Drap.) — angustior^ JefF. Ightham Balea perversa (Linn.). Maidstone (scarce) ; Sevenoaks ; Downe Clausila lam'inata (Mont.) — bidentata (Strom.) — rolphii. Gray. Local Succinea putris (Linn.) — elegans, Risso. Greenhithe ; Deal b. Basommatophora Carychium minimum, MqII. Alexia myosotis (Drap.). Erith ; river Stour, Richborough Leuconia bidentata (Mont.). Rejectamenta of river Stour, Richborough Jncylns fuviatilis, Mull. Velletia lacustris (Linn.) Limncea auricularia (Linn.) — pereger (Mull.) — palmtrii (Mull.) — truncatula (Mall.) — stagnalis (Linn.) — glabra (Moll.). Erith Amphipeplea glutinosa (Mull.). Sandwich ; Deal Planorbis corneus (Linn.) — albus. Mull, Planorbis glaber, Jeff. Thames Marshes ; Paddock Wood — nautileus (Linn.) — carinatus, Miill. — marginatus, Drap. — vortex (Linn.) — spirorbis, Milll. — contortus (Linn.) — fontanus (Lightf.) — lineatus (Walker). Sandwich ; Deal Physa fontinalis (Linn.) — hypnorum (Linn.). Local IL PROSOBRANCHIATA Paludestrina confusa (Frau.). Thames Marshes (almost, if not quite extinct) — jenkinsi (Smith). Thames Marshes below Crossness ; rejectamenta of river Stour ; Hythe (one dead specimen) — ventrosa (Mont.). Erith ; Ramsgate — stagnalis (Bast.). Thames marshes and dykes around the coast Bithynia tentaculata (Linn.) — leachii (Shepp.) Vivipara vivipara (Linn.) Valvata piscinalis (Mull.) — cristata, Mali. Assiminea grayana, Leach. Thames Marshes ; Sandwich Pomatias elegans (Miill.) Acicula lineata (Drap.). Folkestone Neritina fluviatilis (Linn.). River Medway B. PELECYPODA Unio pictorum (Linn.) — tumidus, Retz. Anodonta cygncea (Linn.) Sphierium rivicola (Leach) — corneum (Linn.) — lacustre (Mall.) udium amnicum (Mull.) pusillum (Gmel.) nitidum, Jenyns. Chislehurst fontinale (Drap.). Ebbsfleet. milium (Held.). Keston ; Heme Bay