FAUNA AND FLORA OF NORFOLK : NON-MARINE MOLLUSCA. 8oj 
P. albus, Muller. Common. 
E. Ditches at Acle and Horning Ferry. River 
Yare at Brundall and Coldham Hall, River 
Taas at Stoke Holy Cross (S.S.P), Ditches at 
Colney and Hellesdon (A.M.). 
W. Hunstanton, Lynn, Wormegay, St. Germans, 
West Winch (T.P.), Weeting (A.M.). 
P. gi.aber, Jeff. Rare. 
E. River Wensum at Heigham (Bridgman). 
P. crista (Linne). [ = P. nautileus]. In ponds and ditches. 
Rather local. 
E. Ditch near Horning Ferry (S.S.P.), Pond at 
Bawburgh, Roydon Fen (A.M.). 
W. West Winch (T.P.). 
„ var. l.evigata, Adami. 
E. Pond on Mousehold Heath (A.M.). 
P. carinatus, Miiller. Common in ditches. 
E. Acle, Horning Ferry, Heigham Bridge, near 
New Cut, Reedham, Stoke Holy Cross (S.S.P.) 
Colney, Heigham, Hellesdon. Roydon Fen 
(A.M.). 
W. Saddlebow, Gaywood, Watlington (T.P.), Bio 
Norton, Weeting, (A.M.). 
„ var. disci formis, Jeff. 
E. Colney (A.M.). 
P. umbilicatus, Miiller. [ = P. complanatits\. Very common 
and abundant in ditches, ponds, and rivers 
throughout the county. 
,, var. rhombea. Turton. 
E. Ditches near Yarmouth (A.M.). 
W. In a ditch at Saddlebow (T.P.). 
P. VORTEX (Linne). 
E. Brundall. Bramerton, Stoke Holy Cross, Acle, 
Reedham, Whitlingham (S.S.P.), Colney, 
Heigham, Hellesdon, Thorpe, Costessey.Flordon 
Common (A.M.). 
W. Common in ditches and ponds near Lynn (T.P.). 
Bio Norton, Weeting (A.M.). 
VOL. VIII. 
