226 
EXPLANATIONS TO THE PLATES. 
FIG. PAGE 
16. Cyclas cornea , var. flavescens . . • . .34 
17. „ rivicola •, with foot and siphons protruded 33 
18. „ cornea ....... 34 
Plate IV. to face page 54. 
19. Pisidium Henslowianum ..... 40 
20. „ obtusale .42 
21. „ cinereum .38 
22. „ nitidum . . . . .41 
23. „ pusillum .42 
24. „ pulchellum ...... 39 
25. Driessena polymorpha .20 
26. Paludina vivipara ...... 54 
27. „ Listeri .56 
28. Neritina fluviatilis, and inner face of operculum 60 
Plate V. to face page 72. 
29. Arion hortensis . 
30. Limax agrestis . 
31. Arion ater . 
32. Limax maximus and shell . 
33. „ arborum . 
34. „ tenellus . 
35. „ Sowerbii . 
Plate VI. to face page 88. 
36. Limax gagates , extended and contracted states, 
and shell.... 
. 81 
37. Shell of Testacella Maugei . 
. 89 
38. Testacella haliotidea . 
. 84 
39. Limax flams and shell 
. 74 
40. Geomalacus maculosus 
. 83 
41. Oncidium celticum 
. 89 
75 
69 
73 
78 
77 
79 
