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 A HISTORY OF BEDFORDSHIRE Helix nemoralis, Linn. — hortensis, Mull. Buliminus obscurus (Mull.) Cochlicopa lubrica (Mull.) Azeca tridens (Pult.) Near Luton ; near Bedford ; Barton-le-Clay ; Ampthill Calianella acicula (Mull.) Pupa cylindracea (Da C.) — muscorum (Linn.) Sphyradium edentulum (Drap.) Local and rare Vertigo antivertigo (Drap.) Near Ampthill ; Tottenhoe — substriata (Jeff.) Near Ampthill — pygmaa (Drap.) Clausilia laminata (Mont.) — bidentata (Strom.) Succinea putris (Linn.) — elegans, Risso b. Basommatophora Carychium minimum, Mull. Ancylus fluviatilis, Mull. T. , Velletia lacustris (Linn.) ) ' Limnaa auricularia (Linn.) — pereger (Mull.) — paluitris (Milll.) — truncatula (Mull.) — stagnalis (Linn.) Planorbii corneus (Linn.) — a/bus, Mull. — nautileus (Linn.) — carinatus, Mull. R. Ivel — marginatum, Drap. — vortex (Linn.) Limbury — contortus (Linn.) — fontanus (Lightf.) Limbury Physa fontina/is (Linn.) II. PROSOBRANCHIATA Bithynia tentaculata (Linn.) Pomatias elegans (Mull.) Neritina fluviatilis (Linn.) Great Barford B. PELECYPODA Unit) pictorum (Linn.) — tumidus, Retz. Anodonta cygncea (Linn.) Sphtsrium corneum (Linn.) Pisidium pusillum (Gmel.) — nitidium, Jenyns. Limbury — fontinale (Drap.) and the variety P. henslovjianum — milium (Held.) Biscot 7«>
 * Balea perversa (Linn.)
 * — spirorbis, Mull.
 * — hypnorum (Linn.)
 * — leachii (Shepp.)
 * Vivipara contecta (Millett)
 * Valvata piscina/is (Mull.)
 * — cristata, Mull.
 * Dreissensia polymorpha (Pall.)
 * Pisidium amnicum (Mull.)