LAND AND FRESH WATER MOLLUSCA OF THE EAST RIDING. 135 



Holderness. — Beverley district, not common, Westwood, Cherry Tree 

 Lane (J. D.B. 3). Hornsea, hedgerows, not frequent (J.D.B. 2). 

 AnlabyRoad, Hull (J.D.B. 1). Keyingham (J.D.B. 1). Withernsea 

 (J.D.B. J. ofC. 6, p. 397). Sparingly in hedges and plantations; 

 Sutton ; Hedon ; Kelsey Hill ; Cherry Cob Sands ; Patrington ; 

 Aldborough (T.P.). Driffield district abundant (E.P.B.). Cot- 

 tingham (J.W.B.). 



Hyalinia radiatula (Alder). 



Rare, even if all the records are correct. 



Derwentland. — York district, common round York (R.M.C.). 



Wolds. — Flamborough, in copses (W.C.H. circular 62). Sledmere 

 (W. D.R. circular 93 and J. of C. 6, p. 395). Risby (Beverley 

 F.N. and Sc. Soc. Nat, 7, p. 170) ; sparingly (J.D.B. 3). 



Holderness. — Hornsea (Leeds Conch. Soc, Yorkshire Weekly Post, July 

 nth, 1903) ; south side of Mere (E.P. B.). Hull district, banks of 

 Barmston Drain (J.D.B. 1). 



Hyalinia pura (Alder). 



Rare, except on the Wolds ; apparently a characteristic 

 shell of elevated districts. 



Derwentland. — York district, scarce (R.M.C.). Allerthorpe (Y.N. U. 

 1893). Wressle(G.R.). 



Wolds. —North Grimston, a few (Y.N.U. 1902). Sledmere (T.P.). 

 Harland Rise; Westwood; plentiful (J.D.B. 3). Risby (Beverley 

 F.N. and Sc. Soc. Nat. 7, p. 170; J.D.B. 3). Skidby ; Hessle 

 (J.D.B. 1). Brough and Welton (J.D.B. circular 69; F.W.F. 

 circular 157). Welton (J.D.B. 1). Brantingham Dale (Y.N.U. 

 1901). South Cave (F.W.F. circular in). Drewton Dale (T.P.). 



Holderness. — Meaux (J.D.B. 3). Hornsea, in woods sparingly (J.D.B. 2). 

 Wassand end of mere (F.W.F. Fretwell's Guide and circular 150). 

 Withernsea (J.D.B. 1). Driffield district, common (E.P. B.). 



Var. margaritacea (Jeff.): — North Grimston (Y.N.U. 1902). Sledmere 

 (T.P.). Beverley Westwood (J.D.B. Nat. 8, p. 185). 



Hyalinia crystallina (Mull.). 

 Common throughout the Riding - . 

 Derwentland.— Common at York (W.C.H. ). Allerthorpe (Y.N.U. 1893). 



Wolds.— Howsham Woods (Y.N.U. 1889). North Grimston, a few 

 (Y.N.U. 1902). Sledmere (W.D.R. circular 93; Y.N.U. 1891). 

 Filey, cliff (W.C.H. 2nd circular, 1883; Y.N.U. 1883; Y.N.U. 

 1903). Speeton (J.S.G.). Flamborough (F.W.F. circular 116). 

 Danes DykefY.N.U. 1886). Lowthorpe(Y.N.U. 1890). Londesborough 

 (J.D.B. circular 75). Brantingham Dale (Y.N.U. 1901). Brough 

 and Welton (J.D.B. circular 69 ; F.W.F. circular 157). Drewton 

 Dale (T. P.). 



