LAND AND FRESH WATER MOLLUSCA OF THE EAST RIDING. 1 69 



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

 Beverley, very abundant in nearly every pond, ditch and stream in 

 the district ; Figham ; Long Lane ; Swinemoor ; R. Hull ; Beverley 

 and Barmston drain (J.D.B. 3). Hornsea Mere (J.D.B. 2 ; Y.N.U. 

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

 Hull district, Barmston and Skidby drains ; plentiful (J.D.B. 1). 

 Ditch near Hornsea Bridge (J.D.B. 2). Skidby drain (W. Nelson, 

 J. of C. 6, p. 343). Withernsea (F.W.F. circular 99). Cottingham ; 

 Springhead Road ; Dunswell ; Hedon ; Burstwick drain ; Keyingham 

 drain ; Sutton ; Grimston ; Aldborough ; abundant everywhere 

 (T.P.j. Easington (Y.N.U. 1904). Common and fairly distributed 

 (E.P.B.). 



Var. nucleus (Stud.) ; — Burlington (J.S.G.). 



Var. flavescms (Macgill.) : — Beverley and Barmston drain at Figham 

 (J.D.B. 3). 



Var. regularis Pascal: — Wressle, in the Fleetdyke (G.R., Nat. n, p. 347). 



Subfossil. Holmpton (Phillips 1829, p. 62 ; 1875, p. 71). Skipsea 

 (Phillips, 1829, p. 66 ; 1875, p. 80 ; C. Reid, p. 82). Hornsea (H. F. 

 Hall, p. 45 ; Phillips, 1875, p. 77 ; Reid, p. 82 ; T. Sheppard, Nat. 27, 

 p. 366). Dimlington (?) (Hall, p. 39). Bridlington (Phillips, 1875, 

 p. 83 ; W.C.H., Nat. 12, p. 374). Sandlemere (C. Reid, p. 84). 

 South of Withernsea (W.D.R., J. of C. 7, p. 88). Easington, 

 Holmpton, Neville's Dyke, Mappleton, Atwick Gap, Atwick, Skipsea, 

 Ulrome (T.P., 1892). 



Sphserium rivicola (Leach). 



The Hornsea record has not been confirmed, and it is 

 doubtful whether its distribution at York extends to the East 

 Riding. It is not given as an East Riding species in the 

 Census. 



Derwentland. — York, abundant (Hincks, Ann. Nat. Hist. ser. 1, vol. 5, 

 p. 367 ; Tate, British Mollusks, 1866, p. 34) ; rare in the Ouse 

 (R.M.C.). 



Holderness. — Hornsea Mere (C. Reid, p. 83). 



[Sphserium pallidum Gray. 

 Occurs at York in the Foss (W.C.H.).J 



Sphserium lacustre (Mull.). 



A common species in South Holderness, but not recorded 

 for Derwentland. 



Derwentland. — [York, only one locality, a stagnant pond (S.W.N.) ; a 

 comparative rarity throughout the York district (R.M.C.).] 



Wolds.— Pond near Danes Dyke House (Y.N.U. 1886; W.C.H. 

 " Flamborough " p. 137). Flamborough (F.W.F. circular 116). 

 Tibthorpe (E.P.B.). 



N 



