804 fauna and flora of Norfolk : non-marine mollusca. 
P. spirorbis (Linne). 
E. VVhitlingham, Bramerton, Brundall, Surlingham 
Ferry, ditch near Reedham New Cut, ditches 
at Stoke Holy Cross, Acle, Horning Ferrv, 
Horsey Mere, Heigham Bridge (S.S.P.), Ditch 
at Thorpe, Roydon Fen (A.M.). 
W. Gaywood, Reffley, North Runcton (T.P.). 
P. contortus (Linne). 
E. Ditches at Whitlingham, Bramerton, Surling- 
ham, Brundall, Buckenham Ferry, Stoke Holy 
Cross, Acle, Horning Ferry (S.S.P.), Colney, 
Thorpe, Postwick Roydon Fen (A.M.). 
W. Babingley, North Wootton, Watlington, Gay- 
wood, St. Germans (T.P.), Bio Norton (A.M.). 
P. fontanus (Lightfoot). [=P nitidus]. 
E. In ditches at Bramerton, Horning Ferry, near 
Whitlingham Church (S.S.P.), Colney, Hellesdon 
Roydon Fen (A.M.). 
W. Common in ditches round Lynn, Wormegay, 
North Wootton, Watlington (T.P.). 
Segmentina nitida (Muller). [ = Planorbis lineatus ]. Very 
local. 
E. Whitlingham Marsh (S.S.P.), Thorpe (A.M.), 
Heigham (Bridgman). 
W. Amongst reeds on the Recreation Ground, 
Lynn. (T.P.). 
Physa fontinalis (Linne). Very common in all rivers, 
broads, and large ditches. 
Aplecta hypnorum (Linne). Very local. 
E. In a ditch at Thorpe (A.M.). 
W. Ditch at St. Germans (T.P.). 
,, mons. decollatum, Nelson. 
E. With type at Thorpe (A.M.). 
Paludestrina stagnalis, Bast. [ =Hydrobia ulvee]. Com- 
mon in brackish waters. 
E. Breydon (A.M.). 
W. Wells, Burnham Overy (A.M.). 
