NELSON AND TAYLOR : ON YORKSHIRE MOLLUSCA, 6 1 



8. Dearne — Found in a pond near Doncaster in 1884, by W. Gelder, A. P .T.; 

 Denby Dale, J.W. 



12. Lower Colder — Mill-pond, Gomersall, Dec, 1878, G.T. ! naturalised 



in several ponds round Wakefield, where at different times I have 

 placed them, J.W., 1885 ; two years ago it occurred in a small 

 pond near Wakefield, but it had been introduced, G. Roberts, 

 1885 ; introduced at Newton, near Wakefield, G. Roberts, 1885. 



13. Airedale — Plentifiil in 1864, in pond, Stoney Rock, Leeds ! pond now 



filled up I pond, near Thome's Farm, Osmondthorpe, 1884 ! im- 

 mature specimen in August, 1877 ! now filled up ! very abundant in 

 pond near Dog and Gun Inn, York Road, Leeds, May 31st, 1868 ! 

 pond at Black Hills, Leeds, Sept., 1878 ! common in pond. 

 Foundry Lane, Leeds, June 27th, 1866 ! and June 23rd, 1872 ! 

 pond. High Coldcotes ! numerous in a small brook behind Wilkin- 

 son's Mill, Hunslet, May 7th, 1861 ! since built over, Goodman 

 Street now occupying the site ! pond, near Seacroft Hall, 1874 ! 

 Allerton By water! common in pond, Baildon Green, June, 1883, 

 W. West! The pond at Baildon was stocked by Mr. S. R. 

 Hallam, now of Burton-on-Trent, when resident at Shipley or 

 Bradford, H. T. Soppitt, 1885 ; tannery pond, Kirkstall ! pond, 

 Horsforth Woodside, one specimen, Jan. i8th, 1885 ! 



17. Wensleydale — Canal, Ripon, very common, April, 1884, J. Ingleby ! 



common in Marfield pond, H.P. ! common in ponds at Masham, 



April, 1881, J. Carter ! 

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



pond near Topclifte, sometimes curiously deformed, J. H. Davies, 



1855! common in brickponds on Pilmoor, Oct. 7th, 1882, W.D.R.! 



20. Lower Tees — Placed three years ago in a small pond on Redcar sea 

 banks, near Rifle Range, but did not see any in the pond in spring, 

 1884, B. Hudson. 



22. Upper Derwent — Scarborough, W.B.; the Mere, Scarborough, common, 



H. Appleton! Seamer mere, W.C.H. 



23. Chalk l^o/fl^s — Brantingham, J.D.B.; Burlington, J.S.G., 1881 ; 



Bridlington, numerous in a pond near railway, on west side of line 

 to Scarborough, April 12th, 1884, and Aug., 1885, G. Wingate ! 

 common and very large in Boynton fishponds, Aug. 6th, 1883, 

 L. B. Ross ! 

 , 24. Holderness — Generally distributed about Hull, very plentiful in Spring 

 Dyke, J.D.B., 1878; Cottingham Road, Hull, 1878, Holderness 

 Road, Hull, 1879, Beverley, 1880, J.D.B.; Beverley Parks, 

 rejectamenta of Beverley Beck, 1880, Swinemoor, near Beverley, 

 1880, fine at Long Lane, Beverley, 1881 ; in a ditch strongly im- 

 pregnated with iron, Figham, J.D.B., 1881 ; one specimen at 

 Figham, May 29th, 1882, W.D.R. ! moderately plentiful in drains 

 at Foston and Brigham, L. B. Ross, 1883 ; Hornsea Mere, 1881, 

 J.D.B. 



