A HISTORY OF BUCKINGHAMSHIRE 



Hygromia rufescens (Penn.) 

 Acanthinula aculeata (Mttll.) 



lamellata (JefF.) Ashton Clinton 

 Vallonia pukhella (Mull.) 

 Helicigona lapicida (Linn.) 



arbustorum (Linn.) 

 Helix aspersa, Mall. 



pomatia, Linn. Great Marlow ; Hamble- 



don 



nemoraliSy Linn. 



hortensis, Mttll.* 

 Buliminus obscurus (Mttll.) 

 CoMicopa lubrica (Mall.) 



Azeca tridens (Pult.) Amersham ; Fawley 



Woods 



Ccecilianella acicula (Mull.)* 

 Pupa secale, Drap. 



cylindracea (Da C.)* 



muscorum (Linn.) 

 Sphyradium edentulum (Drap.)* 

 Vertigo pygnuea (Drap.) 

 Balea perversa (Linn.)* 

 Clauiilia laminata (Mont.)* 



bidentata (StrSm.) 

 Succinea putris (Linn.) 



elegans, Risso.* 



b. BASOMMATOPHORA 



Carycbium minimum. Mall. 

 Ancylus fluviatilis, Mall. 



Velletia lacustris (Linn.)* 

 Limncea auricularia (Linn.) 



pereger (Mull.) 



pa/ustris (Mttll.)* 



truncatula (Mtill.) 



stagnalis (Linn.) 



Amphipeplea glutinosa (Mall.) Buckingham 



Taplow 

 Planorbis corneus (Linn.) 



a/bus, Mall. 



nautileus (Linn.) 



carinatus, Mttll. 



marginatuS) Drap. 



vortex (Linn.) 



spirorbis, Mall.* 



contortus (Linn.) 



fontanus (Lightf.) 



lineatw (Walker) 

 Physa fontinalis (Linn.) 



hypnorum (Linn.)* 



II. PROSOBRANCHIATA 



Bitbynia tentaculata (Linn.) 



leachii (Shepp.)* 

 yivipara contecta (Millett) 

 Valvata piscinalis (Mttll.) 



cristata, Mull. 



Pematias e/egans (Mttll.) Halton 

 Aclcula lineata (Drap.) Fawley Woods 

 Neritina Jluviati/is (Linn.) 



B. PELECYPODA 



Dreissensia polymorpha (Pall.)* 

 Unto pictorum (Linn.) 



tumidusy Retz. 

 Anodonta cygncea (Linn.) 

 Sphterium rivicola (Leach) 



corneum (Linn.) 



Sphterium lacustre (Mall.) 

 Pisidium amnicum (Mull.) 



pusillum (Gmel.) 



nitidum y Jenyns * 



fontinale (Drap.) The variety P. 



lou/ianum occurs in the Thames 



hens- 



