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.)
- Balea perversa (Linn.)
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
- — spirorbis, Mull.
— contortus (Linn.) — fontanus (Lightf.) Limbury Physa fontina/is (Linn.)
- — hypnorum (Linn.)
II. PROSOBRANCHIATA Bithynia tentaculata (Linn.)
- — leachii (Shepp.)
- Vivipara contecta (Millett)
- Valvata piscina/is (Mull.)
- — cristata, Mull.
Pomatias elegans (Mull.) Neritina fluviatilis (Linn.) Great Barford B. PELECYPODA
- Dreissensia polymorpha (Pall.)
Unit) pictorum (Linn.) — tumidus, Retz. Anodonta cygncea (Linn.) Sphtsrium corneum (Linn.)
- Pisidium amnicum (Mull.)
Pisidium pusillum (Gmel.) — nitidium, Jenyns. Limbury — fontinale (Drap.) and the variety P. henslovjianum — milium (Held.) Biscot 7«>
