400 PKA.RCR AND MAYFIELD : MOLT.USCA OF EAST NORFOLK. 



P. carinatus Miill. Common, though more local than next 

 species. Ditch at Acle, Horning Ferry, Heigham Bridge, 

 ditch by side of New Cut, Reedham, ditches by River 

 Taas at Stoke Holy Cross, Whitlingham (S.S.P.); ditches 

 at Colney, Heigham, Hellesdon, etc. (A.M.). 

 Var. disciformis Jeff. With type at Colney (A.M.). 



P. umbilicatus Miill. Very common and abundant (S.S.P. 

 and A.M.). 



P. corneus (I^.). Ditch at Acle, Bramerton, Postwick Grove, 

 Whitlingham Marsh (S.vS.P.) ; Colney, Thorpe (A.M.). 



P. contortus (L.). Not at all uncommon. Ditches near 

 Whitlingham Church, Bramerton, Surlingham, Brundall, 

 Buckenham Ferry, and Stoke Holy Cross, in the Bure 

 Valley at Acle and Horning Ferry, where it affects the form 

 ;//i/ior (S.S.P.) ; very plentiful at Colney, Thorpe, Postwick 

 (A.M.). 



Bullinus hypnorum (L.). Decidedly rare. In a ditch at 

 Thorpe, in company with Plaiiorbis s/>irorais and Pisidiuvi 

 foniiuale (A.M.). 

 Monst. decol latum (Nelson). With type at Thorpe (A.M.). 



Physa fontinalis (D.). Common, and generally distributed 

 (S.S.P. and A.M.). 



Amphipeplea glutinosa (Miill.). Local. In a ditch at 

 Colney, in the River Wensum at Heigham and Hellesdon 

 (A.M.). 

 Var. albida Williams. i\ single specimen at Colney (Science 

 Gossip, xxvi., p. 232). 



Limnaea peregra (Miill.). Common everywhere, and in- 

 dulging in all kinds of variation (A.M. and S.S.P.). 

 Var. lacustris Leach. A form found in the Vare and Bure 



valleys at Ranworth Broad and near Brundall (S.S.P.). 

 Var. near vulgaris. Mr. Taylor calls my attention to this 



form, which I took in a ditch near Horsey Mere (S.S.P.). 

 Var. inflata Kob. Ranworth Broad, and also in a ditch at 

 Acle (S.S.R). 



J.C., vii., July 1894, 



