DESCRIPTION OF THE PLATES. 



141 



no, PAGE 



Plate XXIV. 



1,2,3. Cyclas rivicola 116 



4. Cyclas cornea 117 



5. Cyclas lacustris 117 



6. Cyclas calyculata 118 



7. Pisidium obliquum 118 



8. Pisidium fontinale 119 



9. Pisidium obtusale 120 



10. Pisidium appendiculata .... 120 



11. Pisidium nitidum 121 



12. Pisidium pusillum 121 



13. Pisidium cinereum 121 



14. Pisidium pulchellum. Leach 119 



15. 15. Cyclas citrina 131 



16. Neritina fluviatilis, animal. 123 



17. Assiminia Grayana, animal 123 



18. Valvata piscinalis, animal.. 123 



19. Paludina vivipara, animal.. 123 



20. Paludina vivipara, young . . 123 



21. Operculum of Paludina 

 vivipara 123 



22. Succinea amphibia, animal 125 



23. Vertigo sexdentata, animal 126 



24. Cyclostoma elegans, animal 124 



25. Ancylus fluviatilis, animal. 129 



26. Planorbis cornea, animal... 124 



27. Physa hypnorum, animal... 124 



28. Clausilia nigricans, animal. 125 



29. Spawn of Planorbis contor- 



tixs 125 



30. Spawn of Planorbis contor- 

 tus, magnified 125 



31. Spawn of Lymnseus pere- 

 gra, var. ovata 124 



32. Spawn of Lymnaeus pere- 

 gra, var. ovata, magnified. 124 



33. Spavvn of Physa fontinalis. 124 



34. Spawn of Planorbis corneus 124 



35. Spawn of Paludina impura 123 



36. Spawn of Succinea amphi- 

 bea 125 



37. Spawn of Succinea amphi- 

 bea, magnified 125 



38. Spawn of Valvata cristata, 

 magnified 123 



41. 



42. 



43. 



46. 



56. 



PAGE 



Spawn of Paludina impura, 



magnified 123 



Spawn of Lymnsea peregra, 



natural size 124 



Spawn of Lymnaea peregra. 



eggs magnified 124 



Spawn of Lymnsea peregi-a, 



magnified 124 



Lymnsea stagnalis, animal. 124 

 Egg of Physa fontinalis, 



magnified 124 



Spawn of Physa fontinalis, 



magnified 124 



Spawn of Valvata obtusa. . 1 23 



Plate XXV. 



Vitrina pellucida, animal... 126 



Helix nemoralis, animal ... 126 



Helix cellaria, animal 126 



Helix caracolla, animal .... 126 



Helix aspersa, animal 126 



Orifice of Helix aspersa ... 126 



Dart of Helix aspersa 126 



Section of Helix aspersa... 126 



Eggs of Helix nemoralis... 126 



Eggs of Limax rufus 126 



Eggs of Helix Pomatia ... 126 



Limax Sowerbii 128 



Limax Sowerbii, resting 



position 128 



Limax gagates, young 129 



16. Limax gagates, var. ... 129 

 19, 20. Limax gagates, rest- 

 ing position 129 



Limax gagates 129 



22. Limax flavus 128 



Plate XXVI. 

 Testacella Haliotoidea, ani- 

 mal 127 



8. Limax arboreus, var. ... 127 



Limax arboreus 127 



5. Limax arboreus, resting 



position 127 



7. Limax arboreus, young. 127 



