PEARCE AND ^NIAYFIELD : JiIOLLUSCA OF EAST NORFOLK. 399 



Burgh Apton Church (S.S.P.); Costessey Common, 

 CohTcy, Thorpe (A.M ). 



S. elegans Risso. With S. putris often. Bure banks near 

 Yarmouth, Salhouse Broad, Surhngham, Brundail, Bramer- 

 ton, AVhithngham, Trowse, Stoke Holy Cross (S.S.P.) ; 

 Banks of Wensum at Heigham, Hellesdon, and Costessey, 

 Thorpe, Lakenham (A.M.). 

 Var. pfeiflFeri Rossm. With type at Heigham. 



Carychium minimum Miill. Abundant in damp shady 

 places amongst dead leaves. Surlingham Ferry, Whitling- 

 ham Woods, Bramerton (S.S.P.) ; Costessey, Stratton 

 Strawless, Haynford, Earlham (A.M.). 



Segmentina nitida (Miill.). Local. Whitlingham Marsh 

 opposite Thorpe village (S.S.P.); plentiful in a ditch at 

 Thorpe (A.M.). 



Planorbis fontanus (Lightfoot). Ditches at Bramerton, 

 Horning Ferry, and near Whitlingham Church (S.S.P.) ; 

 Colney and Hellesdon (A.M.). 



P. nautileus (I..). Not plentiful. Ditch near Horning Ferry 

 on the River Bure (S.S.P.) ; pond at Bawburgh (A.M.). 

 Var. laevigata Adami. Pond on Mousehold Heath, Nor- 

 wich (A.M.). 



P. albus (L.). Ditches at Acle and Horning Ferr}^, in River 

 Yare on Nuphar leaves at Brundail and Coldham Hall, 

 the Taas at Stoke Holy Cross (S.S.P.) ; ditches at Colney 

 and Hellesdon (A.M.). 

 P. spirorbis Miill. Plentiful in a ditch at Thorpe (A.M.) ; 

 Whitlingham, Bramerton, Brundail, Surlingham Ferry, 

 ditch near Reedham New Cut, ditches at Stoke Holy 

 Cross, at Acle, Horning Ferry, Horsey INIere, Heigham 

 Bridge, etc. (S.S.P. ). 



P. vortex (L.). With the preceding, and also alone. Brun 

 dall, Bramerton, Stoke Holy Cross, Acle, Reedham, Whit- 

 lingham (S.S.P.) ; Colney, Heigham, Hellesdon, Thorpe, 

 Costessey, etc. (A.M.). 



