68 NELSON AND TAYLOR : ON YORKSHIRE MOLLUSCA. 



6. rz-ewt— Doncaster, June 28th, 1877 ! Gravel Drain ! and abundant in 



ditch alongside Black Bank Drain, April 14th, 1883, W.D.R. ! 

 abundant in ditches, Ackholme ! and in River Torne, May 14th, 

 1883! and in ditches near Blaxton Grange! Potteric Carr, J. 

 Emmet, 1882 ; Auckley Common ! Chesterfield Canal near Kive- 

 ton Park Station, April 30th, 1885, W.D.R. ! 



7. Went Vale— River Went, J. Wilcock, 1883 ; Pond, Norton, April 22nd, 



1878 ! Bentley, near Doncaster, 1877 ! West Cowick, near Snaith, 

 in a brick-pond thickly covered with Lemna gibba, June 17th, 1882, 

 W.D.R. ! Ackworth, generally distributed, C. Ashford, 1874; 

 mill dam, Ackworth, on the wall near the house, G. Y. Linney ; 

 Ackworth, mill pond, H. Richardson, 1883 ; common in canal at 

 Wintersett, also in mill stream, W. E. Brown, 1880. 



11. Upper Calder — A specimen found near Brighouse a few years ago, by 



Mr. Ibbetson Walker, Halifax, Hobkirk's Nat. Hist, of Hudders- 

 field, 1868, p. 224; Halifax, March 1877, PLC. ! Elland Wood, 

 J. Conacher, 1877. 



12. Lower Calder — Common in Barnsley canal, and in nearly every stream 



throughout the district, J. Hebden, 1874 ; Pugneys, J. Wilcock, 

 1883 ; Crigglestone ! Sharlston Common, Feb., 1887 ! 



13. Airedale — Pond nr. Killingbeck lake, common 1870 ! pond. Black Hills, 



York Road, Leeds, June 28th, 1883 ! Roundhay Park lake, 1879 ! 

 water trough, Halton ! Newsam Green near Woodlesford, 1872, H. 

 Shaw! pond nr. Haigh Park, Hunslet, June 1882 ! stream, Allerton 

 By water, March 1881 ! common at Lofthouse, G. Roberts, Nat. 

 Hist, and Topog. of Lofthouse, 1882 ! Roundhay and Seacroft, 

 T. W. Bell, Leeds, Merc. Suppl., April 22nd, 1882. 



14. Ma//?a/J7£/a/e— Skipton ! (in collection of T. Rogers, Manchester). 



17. Wensleydale — Pond, Staveley, 1876 ! Eavestone, near Ripon, quite 

 local and not numerous, 1882 ! and Ripon Canal, not very com- 

 mon, Feb. 1883, J. Ingleby ! Skelton, rrear Ripon, April 1884 ! 

 Sharow Mires, not common, H. II. Slater, 1885 ! By the river 

 [Ure]-side after a flood. Rev. James Dalton, 1859. 



i8a. Vale of Mowbray— YaXe of Mowbray, Grainge, 'Vale of Mowbray,' 

 1859, p. 38 ; Wood-end brick ponds, G. R. Baker ; frequent in 

 ditches at Newsham Carr, J. H. Davies, Nat., p. 136, 1855. 



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

 Ferguson, Nat. Hist. Redcar, i860, p. 42 ; ponds, Coatham, and 

 plentiful, brickfields pond, Coatham Marshes, C. Ashford, 'Journ. 

 Conch.,' vol. ii, p. 236, and vol. iii, p. 279 ; Acklam, near Middles- 

 brough, abundant, B. Hudson, 1883 ! 



22. Upper £>e/-M/e/7f— Scarborough ! W. Bean, Theakston's Guide to Scar- 

 borough, loth edition, 1877, p. 177. 



Trans. Y,N,U., iS9o(pub. 1891) Series C 



