FAUNA AND FLORA OF NORFOLK : NON-MARINE MOLLUSCA. 8o 5 
P. ventrosa (Montagu). Ditches near the sea. 
E. Near Breydon (A.M.). 
VV. Lynn, Hunstanton (T.P.). 
P. jenkinsi, Smith. 
E. In a ditch near Breydon (A.M.). 
Bithynia tentaculata (Linne). In rivers and ditches. 
Common throughout the county. 
B. LEACHii (Sheppard). More local than preceding species. 
E. Ditch at Horning Ferry, Acle, by New Cut at 
Rttdham, \\ hitlingham, Stoke Holy Cross 
(S.S.P.), Colney, Heigham, Thorpe (A.M.), 
( ringleford (L. E. Adams). 
W. North Wootton, Gaywood, Lynn, Saddlebow, 
West Winch (T.P.), In the Little Ouse at 
Weeting (A.M.). 
,, var. elongata, Jeff 
E. Surlingham Ferry (S.S.P.) 
„ var. albida, Rimmer. 
W. South Lynn (T.P.). 
Vivipara vivipara (Linne). [ =Paludina ]. In rivers. 
E. Brundall, Bramerton, Surlingham, Wroxham, 
Horning Ferry (S.S.P.), Heigham. Hellesdon, 
Postwick (A.M.). 
W. Weeting (A.M.). 
V. contecta (Millet). In rivers and ditches. 
E. River Bure at Acle, Horning, Wroxham, River 
Yare at Bramerton. Surlingham, Brundall 
(S.S.P.), Ditches in the Wensum valley at 
Heigham, Hellesdon and Costessey. Ditches 
at Colney and Thorpe, Roydon Fen (A.M.), 
Cringleford (L. E. Adams). 
W. Wormegay (T.P.), Bio Norton, South Lopham 
(A.M.). 
Valvata piscinalis (Muller). 
E. Plentiful in ditches, streams, and broads of the 
Yare and Bure valleys (S.S.P.). Colney, 
i ; 
Costessey, Thorpe (A.M.). 
3 c. 2 
