96 



SOPPITT AND CARTER : UPPER AIREDALE MOLLUSCA. 



Limnaea peregra Miill. Common everywhere. 



Var. ovata Drap. Common and fine in the canal at Manning- 

 ham ; Gilstead ; Malham Tarn, 1883 (Roebuck and Butterell). 



Var. labiosa Jeff. Canal, Bingley. 



Var. oblonga Jeff. Canal, Thackley. 



Var. minor Colb. Dam at Greengates, near Apperley. 



Var. ampullacea. Canal, Thackley ; pond, Esholt (A. 

 Hartley). 



Var. Candida Porro. Canal, Saltaire and Bingley. 

 Limnaea auricularia L. Generally distributed. Canal from 

 Bingley to Apperley, very fine ; ditch near Steeton (J. Ellison) ; 

 river Aire, Bingley, and Seven Arches, Bingley. 

 Limnaea Stagnalis L. Rare. Ponds, Fagley ; canal dredgings, 

 Apperley; ditch, Steeton (J. Ellison) ; Malham^ Tarn, 1887. 

 Var. fragilis-variegata Roeb. Common on Potamogeton 

 lucens in Malham Tarn, 1883 (Roebuck and Butterell). 

 Limnaea palustris Miill. Common and generally distributed. 

 Frizinghall Dam; canal, Bingley to Calverley; ditches, Dowley 

 Gap, near Bingley. 

 Var. elongata Moq. Ditches, Dowley Gap. 

 Var. roseolabiata Jeff. Ditches, Dowley Gap. 

 A keeled form near Bingley, 1887. 



A form approaching var. pellucida Roff., Canal, near Saltaire. 

 Var. tincta Jeff". Canal, Calverley. 

 Limnaea truncatula Miill. Generally distributed and commoner 



than the last. Canal from Bingley to Calverley ; ditch, 



Thackley; bog, Shipley Glen; Seven Arches, near Bingley; 



Hawksworth ; Rilstone ; Draughton (W. D. Roebuck) ; Airton 



and Malham. 



Var. minor Moq. Shipley Glen ; under logs of wood in wet 

 places by the side of Malham Tarn, September 1883 (Roebuck 

 and Butterell). 

 Var. ventricosa Moq. Rare. Ditch, Thackley. 

 Limnaea glabra Miill. Rare and local. Pond at Baildon Green, 



1882-3, not taken since. 

 Ancylus fluviatilis Miill. Common in canal, and in most streams 

 in the district. Skipton (W. Nelson) ; Malham Tarn. 

 Var. albida Jeff. River Aire at Malham Cove. 

 Ancylus lacustris L. Rare and local. Pond on Baildon Green : 

 old river-bed, Keighley. 



Naturalist, 



