CENSUS. IO5 



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 2I 2 4 2 7 2 9 3 2 

 3739. Eng. N. 53 5557 6065. Scot. 76 in. 

 Irel. 131. No records for Wales. 

 Paludina contecta Millet. Nineteen counties. 



Eng. S. ii 22 24 2729 31-32. Eng. N. 5356 

 58-59 6 1 64. No records for Wales, Scotland, or Ireland. 

 P. vivipara L. Twenty-eight counties. 



Eng. S. 16 18 2023 2 5 2 7 3 1 35 37 4. Eng. 

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

 or Ireland. 

 Bythinia tentaculata L. Fifty-four counties. 



Eng. S. i 47 912 1525 2730 3234 3740. 

 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 1416 19 21 23 25 2729 3234 

 39-40. Wales 4.5. Eng. N. 53-54 56-57 59 64. No 

 records for Scotland or Ireland. 

 Valvata piscinalis Mull. Fifty counties. 



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

 Wales 41 45 52. Eng. N. 5357 5967 71. Scot. 73 

 76 83 85 89-90. Irel. 142 144. 

 V. cristata Mull. Thirty-two counties. 



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

 45. Eng. N. 54 56-57 59 6164 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 Mull. Thirty counties. 



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

 Wales 41. Eng. N. 53 55-56 58-59 6164 67. Scot. 76 

 85. Irel. 142 147. 

 P. nautileus L. Thirty-six counties. 



Eng. S. 3 6 9 n 16 19 21 23 27-28 30 32 3739. 



