CENSUS OF DISTRIBUTION OF BRITISH MOLLUSCA. 333 



Valvata piscinalis (Miill.). Thirty counties. 



Eng. S. 6 II 15 — 17 19 20 23 24 27 32 — 34 40. 

 Wales 41 45. Eng. N. 535456 57 60 61 63—67 71. 

 Scotl. 73 89. No records for Ireland. 

 V. cristata Miill. Nineteen counties. 



Eng. S. II 14 — 17 22 23 27 32. Wales 41 42 45. 

 Eng. N. 56 61 63 64 66 67. Scotl. 73. No records for 

 Ireland. 

 Planorbis lineatus Walk. Seven counties. 



Eng. S. 14 — 17 27. Eng. N. 61 64. No records 

 for Wales, Scotland, or Ireland. 

 Bavaria ; Frankfurt ; Saxony. 

 P. nitidus (Miill.). Fourteen counties. 



Eng. S. 6 13 16 17 19 37 38. Eng. N. 53 56 61— 

 64 67. No records for Wales, Scotland, or Ireland. 

 P. nautileus (L.). Twenty-two counties. 



Eng. S. 6 9 16 19 23 32 37 38. Wales 41. Eng. N. 

 53 56 — 60 62 — 65 67. Scotl. 73 90. No records for 

 Ireland. 



Bordeaux. 

 P. albus (Miill). Thirty-three counties. 



Eng. S. 3 II 13 15—17, 21—23 32—35 37—40. 

 Wales 41 45 52. Eng. N. 53 — 56 59 60 62 — 65 67 71. 

 Scotl. 73. No records for Ireland. 



Bavaria ; Neumark, Prussia ; R. Rouge, Michigan ; 

 Bordeaux. 

 P. parvus Say. Thirteen counties. 



Eng. S. 3 6 9 17 38. Eng. N. 56 57 63 65—68. 

 Scotl. 108. No records for Wales or Ireland. 



Grand Rapids, Michig. ; Birtle, Rapid City, Beaver 

 Creek, and Pine Creek, Manitoba. 

 P. dilatatus Gld. One county. 



Eng. N. 59. No records for Wales, Scotland, or 

 Ireland. 



Westbrook, Me. 



