NELSON AND TAYLOR : ON YORKSHIRE MOLLUSCA. 55 



thorpe! Middlethorpe Ings, 1865, W. Whitwell ! Dringhouses Bog, 

 July, 1879 ! a few in a pond at Dringhouses, Aug., 1883, G. Web- 

 ster ! common at Askham Bog, Sep. 6th, 1879, W.D.R. ! in one 

 of the deeper .and more open ditches, Askham Bog, R.M.C., 1879 ; 

 Naburn Lock, plentiful in 1877, J.G. ! Strensall Common, fine, 

 1880, and July 13th, 1883, H.P. ! pond on roadside between 

 Ryther and Ulleskelf, H.P. ! Wetherby, May 21st, 1877, H.C. I 

 Tadcaster, Wighill, and pond near Jackson's Wood, Wetherby, 



F. G. Binnie, 1881 ; ponds at Ryther! Healaugh Hall, H.C, 

 1877! common in roadside ditches east of Brafferton, Sep. nth, 

 1882, W.D.R. I very common in pond. Church Feuton, June 21st, 

 1875 ! stream. Church Fenton ! two specimens from pond near 

 Church Fenton Station, 1879! Newton Kyme! pond near Mat- 

 tram Hall, Sherburn, also in stream crossing road near same 

 place, April 12th, 1868 ! Minskip 1 pond at Riccall, June, 1879 ! 

 SpellowHill! Bubwith ! Bishop Dyke near Milford, July 31st, 

 1864 ! and April 1 2th, 1868 ! also in the same stream near Cawood ! 

 common in a pond near Barlby Bank, Selby, Sep. 6th, 1879, 

 W.D.R. ! Asp pond, Knaresborough ! Garforth, April 17th, 1876! 

 Brick-pond at Stanks, 1873 I 



4. Number — Sluggish stream. Ermine Street, Castleford, March 22nd, 



1868! pastures, north of Castleford, in September, G. Roberts; 

 Knottingley, G. T. ! Ferrybridge, J.W., 1885 ; Fairburn, June, 

 1885, W.Webster! Selby, J.W., 1885; canal near Burton Hall, 

 Oct. 17th, 1880 ! ditch. Barlow Common ! dyke, by river-side, 

 Carlton, near Snaith ! Goole, J.W., 1885 ; Howden ! Newsholme 

 Road, near Howden ! Newsholme I pond, Wressle ! pond, 

 between Wressle and Breighton I pond, near Brackenholme ! 

 Newton-le-willows ! 



5. Hatfield and Thome — Plentiful in ditches, Ackholme, May 14th, 1883, 



W.D.R.! plentiful in ditches, Blaxton Grange, May 14th, 1883, 

 W.D.R. ! Potteric Carr, J. Emmet. 



6. Trent — Ponds Doncaster ! 



7. Went Vale — Ackworth, common, C.A., 1854; Ackworth, common in 



several parts, C.A., 1874 ; school canal and mill dam, Ackworth, 



G. F. Linney, 1880; Askern, H.S., 1881 ! Askern Pool, E. Lan- 

 kester, 1842 ; ditch, near Balne Moor, Sept., 1877 ! common in 

 ditch, Cowick Park, Snaith, June 17th, 1882, W.D.R.! Went 

 Vale, W. Graves, 1883 ; rather plentiful, Norton, April 22nd, 

 1878 ! the mill dam, Wintersett, and numerous ponds are the 

 recorded localities — commoner than P. carinatus — W. E. Brown, 

 1880 ; Went Bridge, Hemsworth, Nostel, and Sharlston, J.W., 

 1885. 



8. Dearne — Abundant in canal from Hoyle Mill to Worsborough Dale, 



A.P.T., 1885 ; canal, Barugh, 1877, A.P.T. ; Dearne and Dove 

 canal, W. E, Brady, 1885 ! 



