176 JOURNAL OK CONCHOLOGY, VOL. 16, NO. 6, JUNE, I92I. 



burgh, Berwick, Edinburgh, Banff and ten Irish areas from Cork 



E. to Tyrone. 

 L. peregra. 153. Fresh and stagnant water generally. 

 L. involuta. 2. Barley Lake, Glengariff in Cork W. and Loch 



Crincaum in Kerry N. 



L. praetenuis. i. L. Nagarriva in Kerry S. {Irish Nat., xvi, 286 ; 



xvii, 45 ; XX, 46 ; xxi, 93 ; xxvii, 119 ; xxviii, 9). 

 L. burnetti. 5. Mountain lakes in Carmarthen, Dumfries, 



Perth N., Fermanagh and Westmeath. 



L. palustris. 127. Running and still water and splashes north to 



Ross generally. 

 L. truncatula. 145. Ponds, ditches and wet places generally. 



L. Stagnalis. 88. Ponds, slow rivers, canals north to Linlithgow ; 

 possibly introduced in Scotland. 



L. glabra. 34. Ponds, ditches and splashes north to Perth M. ; 

 not uncommon in north England, rare in south ; in Ireland 

 only in Cork M. (^Irish Nat., xvi, 282 ; xxvii, 77) and requires 

 confirmation ; doubtful records in Wilts. N. and S. 



Amphipeplea (Limncea) glutinosa. 23. Rare in slow running 

 water and lakes, Kent E. to Gloucester W. and Westmorland ; 

 central Ireland. 



Planorbis corneus. 48. Slow rivers, canals and ponds, Kent and 

 Somerset to Yorks. N.W. ; absent from most of Wales and south- 

 west England ; in Scotland only in Lanark ; in Ireland, Kildare, 

 Sligo (? introduced) and doubtful in Limerick. 



PI. albus. 128. Running, still and stagnant vvater, north to Ross 

 generally. 



PI. glaber {parvus, Imvis). 52. Rare in lakes, etc., Kent and 



Somerset to Shetland and Cork to Donegal ; more frequent in 



north. Records for Channel Islands, AVilts. N. and S., Dorset, 



- Surrey and Banff require confirmation. Holocene in Yorks. S.E. 



PI. nautileus (fmA/). 112. Ponds generally. 



PI. dilatatus. 2. This North American alien has lived in the 



canals and rivers near Manchester since 1869 {Journal, i, 81 ; 



xvi, 100; Lanes. Nat., xii (1919) 131). 

 PL carinatus- 80. Slow rivers, canals, lakes, generally in England 



and Ireland, except in west, and north to Edinburgh ; requires 



confirmation for Isle of Wight and Tipperary S. 



PI. COmplanatUS {unibiluatus, viarginaius\ 93. Ponds, rivers, 

 canals generally in England and Ireland, except in west, and north 

 to Edinburgh. Doubtful in Channel Islands and Isle of Wight. 



