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 A HISTORY OF CORNWALL Limnisa pereger (Mttll.) Also occurs in the Scilly Isles palmtrh (Mttll.) truncatula (Mttll.) glabra (Mttll.) Rivulet on hill-top on road to Trevayler through Tremere ; Madron Well between Fowey and Love Amphlpeplea g/utinosa (Mttll.) Near Fal- mouth Planorbh albus, Mttll. g/aber, JefF. Penzance nautilfus (Linn.) -vortex (Linn.) Scilly Isles Planorbh spirorbis, Mttll. Physa fontinalis (Linn.) 1 ,-, , f T. ' Falmouth hypnorum (Linn.) J II. PROSOBRANCHIATA Paludestrina ventrosa (Mont.) Land's End (?) ; Scilly Isles stagna/is (Bast.) Hale Bithynia tentaculata (Linn.) Valvata piscinalis (Mttll.) Pomatias elegans (Mttll.) Perranporth (rare) Acicula lineata (Drap.) Falmouth Neritina fluviatilis (Linn.) Shell drift, St. Ive's Bay B. PELECYPODA River Camel ; Unto margaritifer (Linn.) River Tamar Sphterium corneum (Linn.) Scilly Isles Pisidium amnicum (Mttll.) Castle Horneck Gate ; Falmouth Pisldium pusillum (Gmel.) Crantock ; Treve- thow Pond ; Scilly Isles fontinale (Drap.) ADDENDA Since the foregoing was written and set up in type some important additions have been made to the fauna of the county. Arion intermedium, Norm., has been found near Land's End ; Vallonia costata, Mttll., now known to be distinct from V. pukhella, Mttll., has been taken at Xruro ; Pisidium mi/ium y Held. [i.e. P. gassiesianum, Dupuy] has been met with near Penzance ; and P. obtusale, Pfr., recorded from the Swan Pool, Falmouth ; whilst from the top soil near Newquay a single specimen of Clausilia laminata (Mont.) has been obtained. On St. Michael's Mount a shell of Testa- cello maugei, Fr., was picked up. This is not a likely place for it to have been intro- duced, and in view of the fact that it has lately been found in a holocene rain-wash at Porlock Weir, near Minehead, in a spot too remote from habitation to permit of its pre- sence being accounted for by introduction, this species must now be held to be indigenous to the British Isles. 162