LAND AND FRESH WATER MOLLUSCA OF THE EAST RIDING. 1 55 



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

 canal (J.D.B. 1 ; J.D.B. 3). Swinemoor, and drift Beverley Beck, 

 moderately plentiful (J.D.B. 3). Hornsea Mere (Y.N.U. 1881 ; C. 

 Reid p. 83). Beverley and Barmston drain (J.D.B. in N. & T.). 

 Dunswell ; Burstwick drain ; drain near Covvden ; Keyingham 

 drain ; local, and apparently preferring streams (T. P.). Easington 

 (Y.N.U. 1904). Common from Hornsea to Driffield (E.P.B.). 

 Subfossil. Skipsea (T.P.). Hornsea (T. Sheppard, Nat. 27, p. 366). 



[Planorbis parvus (Say). 



Subfossil, in the mud cliffs of Hornsea, Wm. Nelson, 

 J. of C. 5. p. 139J. 



Planorbis spirorbis (Mull.). 



"In profusion in all ponds," (W.C.H.), accurately 

 describes the distribution of this species. It is far more 

 common than P. vortex. 



Derwentland. — York district, with vortex (S.W.N.) ; general and 

 abundant (R.M.C.). Breighton (J.D.B. circular 75). Newsholme 

 (J.B.). Wressle (G.R.). Cowbridge ; Sandholme ; pond near 

 Sleight's House : Featherbed Lane (Wm. Nelson, J. of C. 5, 

 pp. 262-267). 



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

 1903). Speeton (J.S.G.) ; undercliff, abundant (N. & T.). Flam- 

 borough Head (W.C.H. ; F.W.F. circular it6). Bridlington, debris, 

 a quantity (C. T. Musson in N. &. T.). Kelleythorpe (T.P.). 



Holderness.— Driffield canal (L. B. Ross, circular 145). Wansford (L. B. 

 Ross in N. & T.). Skipsea (N. & T.). Swinemoor ; Leckonfield ; 

 drift of Beverley Beck ; Long Lane ; Kitchen Lane ; abundant 

 (J.D.B. 3). Figham ; Meaux ; New Holland near Meaux (W.D.R. 

 in N. & T.). Hull district, common; Spring Dvke (J.D.B. 1). 

 Hessle; Hessle Road, Hull; Anlaby Road, Hull (J.D.B. in N. &T.). 

 Ditch near Hornsea (W.D.R. in N. & T.). Hornsea Mere (C. Reid, 

 p. 83). Ditch near Wassand, plentiful (J.D.B. 2). Saltend Common, 

 ponds (T.P. Trans. 1, 102) ; probably destroyed by inundation 

 in 1900. Ditch inside the Guard Bank, Saltend (T.P. Trans. 3, 

 p. 41). Haltemprice Lane ; Sproatley; Mappleton ; pools in planta- 

 tions, Hornsea ; Withemsea ; Hedon, Westlands, &c. ; generally 

 distributed (T.P). At Hornsea and in the Foston streams and 

 canal (E. P. B.). 

 Subfossil. Bridlington (W.C.H. Nat. 12, p. 374). Hornsea (H. F. 

 Hall, p. 45). 



Planorbis vortex (Linn.). 



" Cochlea exigua subfusca, altera parte planior, sine 



limbo, quinq : spirarum Huic deest limbo : at parte 



altera sc. superiore planior est, et ubi limbus in proxime 



