64 NELSON AND TAYLOR : ON YORKSHIRE MOLLUSCA. 



6. Trent — Doncaster, J. Wilcock, 1885. 



7. Went Va/e— Campsall Park, J. Wilcock, 1885. 



10. Colne — Not uncommon in Huddersfield canal, J. Whitwham, 1877. 



11. Upper Galder — Halifax, H. Crowther ! Cooper Bridge, Brighouse, 



Mirfield, J. Wilcock, 1885. 



12. Lower Galder — Dewsbury, Isaac Binns, 1862 ; Ossett, J. W^ilcock, 1883 ! 



Newton, pond near Silcoates, and Barnsley canal, J.W., 1885. 



13. Airedale — Micklethwaite, near Bingley, March 12th, 1882 ! near 



Bingley, Sept. 7th, 1884, H. T. Soppitt ; excessively abundant in 

 a pond near Allerton Bywater, March 25th, 1864 ! Methley, G. 

 Roberts ; one or two ponds near Castleford, June 6th, 1870, G. 

 Roberts; Swillington, June 30th, 1872! Newsam Green near 

 Woodlesford, 1872, H. Shaw ; common at Rothwell, H. Shaw ! 

 Haigh Park, near liunslet ! Leventhorpe Pastures, March, 1883 ! 

 pond at Black Hills, not uncommon, June 28th, 1883 ; Leeds 

 and Liverpool canal, Newlay ! 



14. Malhamdale — Abundant, though small, in Malham Tarn, Sept. 1st, 



1883, W.D.R.! ditch, Skipton, E. Collier, 1885! 



17. Wensleydale — River Ure, Tanfield, J. Dalton, 1859 ; abundant in 

 pond at Staveley, Aug. 27th, 1883, E. P. Knubley ! numerous in 

 Staveley fish pond. May 25th, 1885, W.D.R. ! pond at Copgrove ! 



i8a. Vale of Mowbray — Vale of Mowbray, Grainge, 1859; plentiful in 

 ponds and ditches about Thirsk, J. H. Davis, 1855 ; abundant in 

 brick ponds on Pilmoor, Oct. 7th, 1882, W.D.R. ! 



20. Lower Tees — General in Lower Tees district, J. W. Watson, 1881 ; 

 several waters near Roseberry in Cleveland, 1879, C. Ashford ; 

 a few from a stell on inland side of Coatham Marshes, B. Hudson, 

 1885. 



22. Upper Derwent — Scarborough, W. Bean, 1871. 



23. Chalk Wolds — Bridlington, plentiful on caddis-cases, in pond on west 

 side of railway line to Scarborough ; Easter, 1884, G. Wingate! 

 Bridlington, 1867, G. Roberts. 



24. Holderness — Very abundant about Beverley, at Swinemoor, Figham, 

 drift of Beverley Beck, Kitchen Lane and pond near England 

 Springs, J.D.B., 1882 ; ditch at Figham, strongly impregnated 

 with iron, J.D.B. , 1880 ; Wansford, L. B. Ross, 1883 ; Newland, 

 Hull, 1878, Cottingham Road and Spring Dyke, 1885, J.D.B. ; 

 Hornsea Mere, common, June 6th, 1S81, W.D.R.! common at 

 Meaux, and at New Holland, near Meaux, May 29th, 1882, W.D.R. ! 



Var. albida Jeffreys. 



3, Vale of York— Bitch near the Ouse, below York, 1865, W. Whitwell ! 



4. Number — Several at Ferrybridge, 1871, J. Wilcock ; a mature but 



dwarf specimen in a sluggish stream at Castleford, 1866 ! 



Trans.Y.N.U., 1S84 (pub. 18S6). Series C 



