JOURNAL OF CONCHO LOGY. 327 



YORKSHIRE LOCALITIES FOR SPH^RIUM AND 

 PISIDIUM. 



By J. WILCOCK. 



[The following list of Yorkshire stations for the species of 

 the above genera was kindly supplied by Mr, Wilcock for the 

 "Transactions of the Yorkshire Naturalists' Union," but unfor- 

 tunately came to hand too late to be incorporated in the 

 "Report."— Ed.] 



Sphaerium corneum L. River Nidd nr. Cowthorpe; Chapel 

 Haddlesey; Keadby Canal; Stainforth; Went Vale; 

 Dove Canal, Wath; Swinton; and at Knaresbro'. 



S. corneum v. flavescens Macgill. Rare in the Barnsley 

 Canal near Cudworth. 



S. rivicola Leach. Conisbro'; Cold Hiendley Reservoir; Canal 

 at Notton; River Don at Rotherham and Doncaster; 

 Castleford; and fish pond, Crofton. 



S. ovale Fer. Rarely near Conisbro'; abundant in canal at 

 Stanley and Altofts. 



S. lacustre Mull. Scarce in a pond at Ferrybridge; and in 

 canal at Notton; abundant in a pond on Sharlston 

 Common. 



Pisidium amnicum Miill. River Nidd at Cowthorpe; pond at 

 Bramham; Knottingley and Goole Canal; Allerton 

 Bywater; Castleford; Smeaton; Rotherham; Dove 

 Canal, Wath; and Saltaire. 



P. fontinale Drap. River Nidd at Cowthorpe; common in 

 several ponds at Haddlesey; Smeaton; Askern; Rother- 

 ham; River Dearne, Cudworth; Kirk Sandal; Barnby 

 Don; near EUand; Kirklees near Mirfield; Canal at 

 Saltaire; River Wharfe near Beamsley; Addingham; and 

 Knaresbro'. 



P. fontinale v. Henslowana Shepp. Knottingley; Stanley 

 Canal, Altofts. 



