FOKMATION. 



Cydas pnsilla, Turt. 

 rivicola. Lam. 

 Cjrena trigonula. Wood. 

 Unio littoralis, Drap. 



Unio ovalis, Turt. 

 pictomm. Lam. 

 txunidus, Retz. 



Gasteropoda. 



Achatina acicula, Hull. 

 Acme fusca, Turt. 

 Ancylus fluviatilis. Mull. 

 lacustris, Mull. 

 Axeca tridens, Leach. 

 Balsea perversa, Turt. 

 Bithynia tentaculata, Linn. 

 ventricosa, Turt. 

 Bulimus Lackhamensis, Mont. 

 lubricus, Bnig. 

 obscurus, Brap. 

 Caryehium TninimnTn , Mull. 

 Clausilia bidens, Drap. 

 biplicata, Turt. 

 nigricans, Turt. 

 Eolphii, Leach. 

 Cyclostoma elegans, Ih-ap. 

 Helix aculeata. Mull. 

 alliaria. Mill. 

 arbustorum, Linn. 

 celiaria, 3Iull. 

 crvstallina, Drap. 

 excavata. Bean. 

 frnticum, Drap. 

 fulva, Midi. 

 hispida. Mull. 

 hortensis. Lister. 

 lamellata. Turf. 

 lapicida, Linn. 

 lucida, Drap. 

 nemoralis. Mull. 



Helix nitidula, Drap. 

 plebeia, Drap. 

 pulchella, 3Ltll. 

 pura. Alder. 

 radiatnla. Alder. 

 rotnndata, Mull. 

 ruderata, Studer. 

 mfescens, Penn. 

 virgata, Mont. 

 Limax agrestris, Linn. 

 Limnaens aurieularis, Drap. 

 palustris, Drap. 

 pereger, Drap. 

 stagnalis, Mont. 

 tmncatulns. Mull. 

 Paludina marginata, Mich. 

 Physa fontinalis, Drap. 

 hypnormn, Drap. 

 Planorbis albns. Mull. 



carinatus. Mull. 

 contortns, Drap. 

 comeus, Drap. 

 imbricatns. Mull. 

 Isevis, Alder. 

 marginatus, Drap. 

 nitidus. Mull. 

 spirorbis. Mull. 

 vortex. Mull. 

 Pupa anglica, 3rich. 

 cvlindrica, Fer. 

 edentula, Drap, 



