Quarterly Journal of Conchology. 35 



Helix virgata Da Costa. — At Dartforcl, on chalk. 



Helix caperata Montagu. — Througlioiit district ; also the var 

 ornata (Picard), and var major {Jeffreys), occurred on Thames 

 wall ; a variety, with the spire slightly elevated, occun'ed in gravel 

 pit, Erith. 



Helix rotnndata Muller.— Plentiful throughout. 



Helix pnlchella Muller. — Sparingly, in brick field, Erith, 



Helix lapicida Linne. — Dead shell, at Plumstead. 



Bulimus obscurus Midler. — On chalk, at Dartford ; also sparingly 

 elsewhere. 



Pupa nmbilicata Drapamaud. — With Helix roiundata in oak 

 woods. 



Clausilia rngosa Drapamaud. — In the brick fields ; plentiful 

 also throughout the district. 



Clausilia RolpMi Gray. — Plentiful in Belvedere Park, on sandy 

 soil, under chestnut trees ; also at Plumstead Common. 



Clausilia biplicata Montagu. — Two shells, amongst the tidal 

 refuse on the shore at Dartford Creek. 



Clausilia laminata Montagu, and var pellucida {Jeffreys). — At 

 Dartford, on chalk. 



Conovulus denticulatus var myosotis. — Yery abundant on the 

 Thames banks, with Assiminea Grayana, ko,. 



Carychium minimum Muller. — In woods, Erith. 



Cylostoma elegans Muller. — At Dartford, on chalk only. 



Zua lubrica Muller. —Not very plentiful in Erith. 



The following analysis of the fifty-four species I found there may 

 be interesting : — 



Pisidium amnicum, Planorhis albus, P. carinatus, Ancylus fluvia- 

 tilis, Limncea stagnalis, and Valvata piscmalis — occurring in the 

 rivers Cray and Darent. 



Hydrobia ventrosa, Assiminea Grayan,rti^ Conovulus denticulatus, 

 and Clausilia biplicata — all occur within reach of the tide. 



Helix aculeata, H.fulva, Limax arborum, and Clausilia Rolphii — 

 occur only in woods and uncultivated land. 



Clausilia laminata, Cyclostoma elegans, and Helix virgata — occur 

 on the chalk at Dartford only. 



lAmna'a glabra, L. truncalida, and Planorbis nautileus — were 

 found each in only one spot in the district. 



The remaining thirty-four species may be regarded as of general 

 occurrence in the district. 



6, MoiBA Place, Southampton. 



A VARIETY OF LAND SHELL NEW TO BRITAIN. 

 (CLAUSILIA RUGOSA, var "SCHLECHTII," Zelebor.) 



By W. D. SUTTON. 

 Having been fortunate enough to find dui-ing the last few months 

 a new and distinct variety of Clausilia rugosa, hitherto not noticed as 

 occurring in Britain, and which has been kindly determined for me by 



