52 NELSON AND TAYLOR: ON YORKSHIRE MOLLUSCA. 



pond near Smeaton Crags ! Smeaton, 1871, G. Roberts ; pond in 

 a field about 300 yards above Wentbridge, H. Richardson, 18S3 ; 

 Norton, one or two specimens, April 22, 1S78 ! 



8. Dearne — Barnsley canal, below Barugh Lock, June 19th, 1877, A. P. 

 Taylor ! Bretton, J.W., 1885 ; numbers of dead shells obtained from 

 the mud cleaned out of the fish pond, Cusworth Park near Don- 

 caster, 1883, T. H. Easterfield I 



10. Co//7e— Huddersfield canal, rare, G. H. Parke in Hobkirk's 'Hudders- 



field,' 1868 ; common in a dam at Deighton, J.Wh. 



11. Upper Ca/der — Luddenden Valley, July 10, 1875, J.C. ; Halifax, J.W. 



12. Lower Catder — Common in the Wakefield and Barnsley canal, J. H., 



1874 ; Cold Hiendley, Chevet, and New Millerdam, J.W., 1885 ; 

 pond near Sandal Castle! Bottom Boat near Wakefield, H.C., 

 1877! 



13. Airedale — Common in pond, Baildon Green, July, 1882 ! and Aug. 19, 



1883, W.D.R. ! canal, Micklethwaite, March 12th, 1882 ! Bingley, 

 J.W., 1885 ; canal at Saltaire, J.W., 1885 ; ditch, Waterloo, near 

 Leeds, April 3rd, 1866 ! Leventhorpe, 1883, G. Roberts ; very 

 numerous in a small brook behind Wilkinson's Mill, Hunslet, May 

 7, 1861 ! the locality built over soon after, Goodman Street now 

 stands on the site ; reservoir. Cross Stamford Street, Leeds, IL 

 Pollard, 1876 ! pond. Black Hills, Leeds, April, 1883 ! in stream, 

 Fleet Mills, Swillington, April, 1883 ! 



16. Wensleydale — Canal at Ripon, J. Ingleby, 1883 ! Fearby Cross, near 

 Masham, H.P., 1877 ! Birk Rigg, three miles from Hawes, H.C., 

 1877! 



22. Upper Derwent — Common in the Mere, Scarborough, H. Appleton, 



1884! Scarborough, several, R.M.C., 1883! Seamer Mere, 

 W.C.H., 1879 ; pond near Cayton Bay, April, 1879 ! 



23. Chalk Wolds — Leckonfield Moat, 1880, J.D.B. ; Bridlington, on caddis- 



cases in pond west of railway-line to Scarborough, Easter, 1884, 

 G. Wingate ! 



24. Holderness — Hornsea Mere, June 6th, 1881, W.D.R. ! River Hull, at 



Driffield, moderately common, 1882, L.B.Ross ! Beverley, J. D.B.; 

 ditch, strongly impregnated with iron, at Figham ! and at New 

 Holland near Meaux, May 29th, 1882, W.D.R. ! Leven canal, 1878, 

 J.D.B. ! 



Var. disciform is Jeffreys. 



Planorbis carinatus var. S lucidus Pascal ! 

 We are inclined to regard as synonymous with this form 

 the variety which Pascal describes as follows : — 



Trans.Y.N.U., 18S4 (pub. ISSC). Series C 



