LAND AND FRESH WATER MOLLUSCA OF THE EAST RIDING. 165 



Holderness. — Driffield, canal (J.D.B. and L. B. Ross, circular 145); 

 plentiful in R. Hull (L. B. Ross in N. & T.). Foston, plentiful in 

 R. Hull (L. B. Ross in N. & T. ). Beverley, abundant and generally 

 distributed ; Leven canal ; Long' Lane (fine) ; Swinemoor ; Figham ; 

 R. Hull; Leckonfield Moat (J.D.B. 3). Hornsea Mere (Y.N.U. 

 1881 ; C. Reid p. 83 ; F.W.F. Fretwell's Guide and circular 150). 

 Ditch near Hornsea Bridge (J.D.B. 2). Withernsea (F.W.F. 

 circular 99). Hull district, common (J.D.B. 1). Dunswell ; Cotting- 

 liani ; Burstwick drain ; Ryhill drain ; common (T. P. ). Abundant, 

 Wansford and Foston (E.P.B.). 



M. decollation Jeff. Hornsea (Y.N.U. 1SS1). 



\*ar. cornea Locard. Fleetdyke, Wressle (G.R.). 



Subfossil. Skipsea (Phillips, 1S29, p. 66 ; 1S75, p. So ; Reid, p. 79). 

 Hornsea (H. F. Hall, p. 45; Phillips, 1875, p. 77; Reid, p. 82; 

 T. Sheppard, Nat. 27, p. 366). Holmpton (Phillips, 1829, p. 62; 

 1S75, p. 71). Bridlington (W.C.H. Nat. 12, p. 374). Holmpton; 

 Skipsea ; opercula only, Ulrome (T.P. 1892). 



Bythinia leachii (Shepp.). 



Local in Dervventland and Holderness, but common in 

 several stations in the latter district. 



Derwentland. — Wressle, Fleetdyke on caddis case, rare (G.R. ). Bubwith 

 (J.D.B. circular 75). Near Brough (Y.N.U. 1878; J.D.B. circular 

 69). York (Hincks, Ann. Nat. Hist. Sen I. 5, p. 367, 1840). 



Holderness. — Driffield, debris from canal (J.D.B. circular 145). Hornsea 

 Mere (Y.N.U. 1881 ; C. Reid, p. 83 ; F.W.F. Fretwell's Guide and 

 circular 150). Ditch parallel to Leven canal ; Figham ; scarce 

 (J.D.B. 3). Barmston drain, near Hull (J.D.B. 1). Dunswell Lane ; 

 Sutton drain ; common in both localities (T. P.). Endyke Lane 

 (J.W.B.). Abundant in canal and streams, Wansford and Foston 

 (E.P.B.). 



Distribution of Paludestrina jenkinsi. 



Paludestrina jenkinsi (Smith). 



Not in the Census. Only found in the neighbourhood of 

 Hedon at present but it appears to be extending" its range. 



