80 



INDEX. 



Fig. Page. 



25 Helix umbilicata 42 



26 Helix limbata 43 



27 Clausilia laminata 52 



28 Clausilia biplicata 53 



29 Clausilia plicatula 53 



30 Clausilia nigricans 54 



31 Clausilia nigricans var 



dubia 54 



32 Zualubrica 54 



33 Azeca tridens 55 



34 Helix pygmsea 43 



PLATE VII. 



1 Bulimus acutus 43 



2 Bulimus. Lackharaensis 44 



3 Bulimus obscurus 44 



4 Pupa umbilicata 45 



5 Pupa muscorum 46 



6 PupaAnglica 46 



7 Pupa secale 47 



8 Pupa edentula 47 



9, Pupa minutissima 48 



10 Pupa pygmsea 48 



11 Pupa substriata 49 



1 2 Pupa anti vertigo 49 



13 Pupapusilla 50 



14 Pupa Venetzii 50 



15 Balsea fragilis 51 



16 Achatina acicula 56 



17 Planorbis corneus 59 



18 Succinea putris 57 



19 Succinea oblonga 58 



2 Phy sa fontinalis 58 



2 1 Planorbis glaber 61 



22 Planorbis nitidus 64 



23 Planorbis nautileus 61 



24 Planorbis carinatus 61 



25 Planorbis lacustris 64 



. 60 



Planorbis marginatus... 62 

 Planorbis spirorbis ... 



Planorbis vortex 



Planorbis contortus... 



Limnseus glutinosus 

 Limnseus involutu s . . . 



Fig. 



26 Physa hypnorum . 



27 Planorbis albus . 

 28 



29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 42 

 43 

 44 



Limnseus stagnalis ... 

 Limnseus truncatulus 



Limnseus glaber 



Ancylus. fluviatilis ... 

 Ancylus oblongus ... 

 Limnseus palustris ... 

 Limnseus Burnetti ... 

 Limnseus pereger ... 

 Conovulus denticulatus. 72 

 Conovulus bidentatus ... 71 

 Conovulus bidentatus 

 var albus 71 



45 Limnaeus auricularius... 66 



46 Carychium minimun ... 72 



47 Acme lineata 74 



48 Cyclostoma elegans ... 73 



PLATE VIII. 



1 Neretina fluviatilis 16 



2 Assiminia Grayana ... 19 



3 Paludina Listeri 17 



4 Planorbis albus 60 



5 Succinea putris 57 



6 Helix Cantiana 32 



7 Conovulus denticulatus. 72 



8 Cyclas cornea 8 



9 Cyclostoma elegans ... 73 



10 Limnseus auricularius .. 67 



11 Anodonta cygnea ...14, 15 



