CENSUS. 105 



55—59 63-64. Scot. 76-77. No records for Wales or 

 Ireland. 

 Neritina fluviatilis L. Thirty-two counties. 



Eng. S. 3 6 9 II 13-14 16 18-19 21 — 24 27 29 32 

 37—39. Eng. N. 53 55—57 60—65. Scot. 76 III. 

 Irel. 131. No records for Wales. 

 Paludina contecta Millet. Nineteen counties. 



Eng. S. II 22—24 27—29 31-32. Eng. N. 53—56 

 58-59 61 — 64. No records for Wales, Scotland, or Ireland. 

 P. vivipara L. Twenty-eight counties. 



Eng. S. j6— 18 20—23 25 27 31—35 37—40- Eng. 

 N- 53 55 — 59 61 — 64. No records for Wales, Scotland, 

 or Ireland. 

 Bythinia tentaculata L. Fifty-four counties. 



Eng. S. I 4—7 9—12 15—25 27—30 32—34 37—40. 

 Wales 41-42 47. Eng. N. 53 — 67. Scot. 76. Irel. 113 

 115 142 144. 

 B. leachii Shepp. Twenty-eight counties. 



Eng. S. 6 II 14 — 16 19 21 23 25 27 — 29 32 — 34 

 39-40. Wales J5. Eng. N. 53-54 56-57 59—64. No 

 records for Scotland or Ireland. 

 Valvata piscinalis Miill. Fifty counties. 



Eng. S. I 6 9 11-12 15 — 25 27-28 32 — 34 38 — 40. 

 Wales 41 45 52. Eng. N. 53—57 59—^7 7i- Scot. 73 

 76 83 85 89-90. Irel. 142 — 144. 

 V. cristata Miill. Thirty-two counties. 



Eng. S. 6 II — 19 21 — 23 25 27-28 32. Wales 41-42 

 45. Eng. N. 54 56-57 59 61—64 66-67. Scot. 73 77 

 90. No records for Ireland. 

 Planorbis lineatus Walk. Eleven counties. 



Eng. S. 14 — 17 21 — 23 27-28. Eng. N. 60-61 64. 

 No records for Wales, Scotland, or Ireland. 

 P. nitidus Miill. Thirty counties. 



Eng. S. 6-7 II 13 16-17 19 21 27-28 31 37 — 40. 

 Wales 41. Eng. N. 53 55-56 58-59 61—64 67. Scot. 76 

 85. Irel. 142 147. 

 P. nautileus L. Thirty-six counties. 



Eng. S. 3 6 9 II 16 19 21 23 27-28 30 32 37-39- 



