92 



SOPPITT AND CARTER: UPPER AIREDALE MOLLUSCA. 



MOLLUSCA AQUATILIA. 

 CONCHIFERA. 

 SPH^RIID^. 



Sphasrium corneum L. Abundant and generally distributed. 

 Leeds and Liverpool Canal, Manningham, Saltaire, Bingley, 

 Apperley and Calverley ; ditch near Bingley ; pond near 

 Cottingley Bridge ; ]\Ialham Tarn. 

 Var. flavescens ^Nlacgill. Canal, Saltaire. 



Var. nucleus Stud. Common in Frizinghall Dam ; canal, 

 Calverley; not uncommon in Malham Tarn, 1883 (Roebuck 

 and Butterell). 



Sphserium rivicola Leach. In great abundance in Leeds and 

 Liverpool Canal, but being chiefly an inhabitant of the mud at 

 the bottom, is seldom obtained by dredging. Saltaire, Gilstead, 

 Thackley, and near Apperley. 

 Var. compressa Pasc. Apperley, 1887. 



Sphserium lacustre Mull. Generally distributed and fairly 

 common. Pond on Baildon Green; canal, Saltaire; ditch, 

 Dowley Gap, near Bingley ; pond at Bradford Moor ; dam at 

 Greengates ; pond at Calverley ; pond at Rilstone ; Esholt 

 (A. Hartley). 



Var, brochoniana Bourg. Ditch, Dowley Gap ; pond, Brad- 

 ford Moor. 



Var. ryckholtii Norm. Pond, Baildon Moor; Esholt (A. Hartley). 

 Pisidium amnicum Mlill. Local, and by no means common. 



Canal, Saltaire ; Bingley, Apperley, Malham Tarn. 

 Pisidium fontinale Drap. Common and generally distributed. 

 Ponds, Bradford Moor ; near Apperley, fine and plentiful ; 

 ditches, Calverley, Thackley, Tong Park, Hawksworth ; Canal 

 near Esholt ; Airton and Malham, in bogs. 

 Var. henslowana Shepp. Canal near Esholt ; ditch, Thackley. 

 Var. pulchella Jenyns. Pond, Bradford Moor. 

 Var. cinerea Alder. Shipley Glen, Baildon Moor. 

 Pisidium pusilliim Gmelin. Common and generally distributed. 

 Pond, Bradford jNIoor; bog, Shipley Glen, numerous; Baildon 

 Moor ; ditch, Dowley Gap ; Thackley ; stream, Calverley ; bog, 

 Cullingworth; not uncommon in Malham Tarn, September 1883 

 (Roebuck and Butterell). 

 Var. obtusalis. Bog, Shipley Glen. 

 Pisidium nitidum Jenyns. Bindey (T. Hebden, Trans. Y.N.U.). 



i U k¥ 1R8 a Naturalist, 



