A HISTORY OF BEDFORDSHIRE 
Helix nemorals, Linn. Limnea auricularia (Linn.) 
— hortensis, Mull. — pereger (Mull.) 
Buliminus obscurus (Mull.) — palustris (Mull.) 
Cochhicopa lubrica (MUll.) — truncatula (Mull.) 
Azeca tridens (Pult.) Near Luton; near — stagnalis (Linn.) 
Bedford ; Barton-le-Clay ; Ampthill Planorbis corneus (Linn.) 
Celtanella acicula (Mull.) — albus, Mull. 
Pupa cylindracea (Da C.) — nautileus (Linn.) 
— muscorum (Linn.) — carinatus, Mull. R. Ivel 
Sphyradium edentulum (Drap.) Local and — marginatus, Drap. 
rare — vortex (Linn.) Limbury 
Vertigo antivertigo(Drap.) Near Ampthill; *— sfirorbis, Mull. 
Tottenhoe — contortus (Linn.) 
—— substriata (Jeff.) Near Ampthill — fontanus (Lightf.) Limbury 
— pygmea (Drap.) Physa fontinalis (Linn.) 
* Balea perversa (Linn.) *— hypnorum (Linn.) 
esi ree roa anmaaes II. PROSOBRANCHIATA 
Succinea putris (Linn.) Bithynia tentaculata (Linn.) 
— elegans, Risso *— leachii (Shepp.) 
*Vivipara contecta (Millett) 
bs BASOMMANORHORA *Valvata piscinalis (Miull.) 
Carychium minimum, Mull. *— cristata, Mull. 
Ancylus fluviatilis, Mull. . Pomatias elegans (Mull.) 
Velletia lacustris (Linn.) j Diary Neritina fluviatilis (Linn.) Great Barford 
B. PELECYPODA 
* Dreissensia polymorpha (Pall.) Pisidium pusillum (Gmel.) 
Unio pictorum (Linn.) — nitidium, Jenyns. Limbury 
— tumidus, Retz. — fontinale (Drap.) and the variety P. 
Anodonta cygnea (Linn.) henslowianum 
Spherium corneum (Linn.) — milum (Held.)  Biscot 
* Pisidium amnicum (Mull.) 
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