188 MR. ARTHUR MAYFIELD ON THE MOLLUSCA OF NORFOLK. 
Clausilia rugosa, Drap., var. everetti, Miller. Earlham. 
,, var. tumidula, Jeff. Whitlingham Woods (S.S.E) 
,, var. albina, Moq. Yelverton (S.S.P.). 
Cochlicopa lubrica, Mull., var. lubricoides, For. Whitlingham 
Marsh (S.S.P.). 
Succinea elegans, Kisso, var. pfeifferi, Eossm. With type at 
Heigha'm. 
Planorbis nautileus (L.), var. laevigata, Adami. With the 
usual form in the pond near Mousehold Heath. 
P. carinatus, Mull., var. disciformis, Jeff. Colney. 
P. umbilicatus, Mull. (=P. complanatus, Jeff), var. rhombea 
(Turt.). In ditches near Great Yarmouth. 
Bullinus (=Physa) iiypnorum (L.) In a ditch at Thorpe, with 
Plan, spirorbis and Pisidium fontinale. 
„ mons. decollatum (Nelson). With above. 
Amphipeplea glutinosa (Miill.), var. albida. Williams. Shell 
milk-white. A single specimen at Colney. 
LimN/Ea peregra (Miill.), var. lacustris, Leach. Pan worth 
Broad, and near Brundall (S.S.P.). 
,, var. inflata, Kob. Eanwortli Broad, ditch near 
Acle (S.S.P.). 
,, var. margaritacea, Esm. Heigham. 
„ var. Candida, Porro. Ditch by side of New Cut 
near Beedham (S.S.P.). 
L. palustris (Miill.), var. tincta, Jeff. Brundall, Beedham 
(S.S.P.). 
„ var. carinata, Pearce. In a ditch by the side of the 
New Cut, Beedham (S.S.P.). 
Velletia lacustris (L.), var. compressa, Jeff. In the Yare at 
Brundall (S.S.P.). 
Neritina fluviatilis (L.), var. pallida, Pascal. In the Wensum 
near Norwich Waterworks. 
„ var. trifasciata, Colb. With above. 
Bytiiinia leachii (Shepp.), var. elongata, Jeff Surlingham 
Ferry (S.S.P.). 
Sphterium corneum (L.), var. flavescens (Macgill.). Colney. 
„ var. nucleus (Stud.). Near Bramerton and 
Whitlingham (S.S.P.). 
,, var. pisidioides, Gray. Colney. 
