108 LAND AND FRESH-WATER SHELLS. 



Ancylus fluviatilis Mull. 



Eng. S. i 4 6 8-9 ii 17 19-20 23 28 32 34 40. 



Wales 41 44 50 52. Eng. N. 54 65 67 69 71. Scot. 



73 75 80 82-83 85 87 89-90 92 95 98 ioi 104 107-108 



no. Irel. 113 115-116 120 124 127 136 138 139 142 144 147. 



Velletia lacustris (L.). 



Eng. S. 6-7 9 ii 13-14 16 1923 2734 3640. 

 Wales 41 45 47. Eng. N. 5467. Scot. 73 85 90 93. 

 Irel. 124 142 144. 



It will be seen on perusal of the above census that the 

 principal places to be regarded as among the uninvestigated and 

 "dark corners" of the kingdom are Scotland and Ireland, Mid- 

 Wales, and the eastern and south-western counties of England, 

 specimens from any of which districts will be of unusual value 

 and importance. 



KEY TO THE ABOVE. 



o, Channel Isles; i, Cornwall West, divided from Cornwall 

 East by the high-road from Truro through St. Columb to the 

 inland extremity of Padstow Creek ; 2, Cornwall East ; 3, Devon 

 South, divided from North Devon by the watershed line, which 

 commences at the Tamar, about midway between Tavistock and 

 Launceston, passes over the ridge of Dartmoor, and joins the 

 Western Canal at Tiverton ; 4, Devon North; 5, Somerset South, 

 divided from North Somerset by the River Parret from Bridge- 

 water to Ilchester, the line thence curving round to the N. 

 extremity of Dorsetshire ; 6, Somerset North ; 7, Wilts. 

 North, separated from Wilts. South by the Kennett and 

 Avon Canal; 8, Wilts. South; 9, Dorsetshire; 10, Isle of 

 Wight; n, Hants South, divided from Hants North by the high- 

 roads running W. and E. to the borders of Wilts and Sussex 

 respectively, through Stockbridge and Petersfield ; 12, Hants 

 North; 13, Sussex West, divided from East Sussex by the 

 high-road from Brighton to Cuckfield, thence through Crawley 

 to the Surrey border; 14, Sussex East; 15, Kent East, divided 

 from W. Kent by the Medway and its tributaries from its mouth 

 nearly up to Staplehurst, thence the line is along the high-road 



