LAND AND FRESH WATER MOLLUSCA OF THE EAST RIDING. 163 



Derwentland. — York district: "In vadis lapidosis fluvii Ouse " (Lister, 

 Hist. Animal, Angliae p. 151) ; in the Ouse (W.S.N.) ; rare, in stony 

 places in the Ouse (R.M.C.). 



Wolds. — Speeton (J.S.G. ; W.C.H. " Flamborough," p. 137). Flam- 

 borough, ponds near the cliffs (W.C.H. circular 62 ; F.W.F. circular 

 116). Lowthorpe (Y.N.U. 1890). North Grimston (A. H. Taylor 

 circular 165). Stream on approaching South Cave from Mount 

 Airy (F.W.F. circular 157). Hotham Beck (H. F. Parsons, Nat. 4, 

 90). Brough (Goole Sc. Soc. Nat. 2, p. 170; H. F. Parsons, Nat. 

 4, 90); in the streamlets, (3rd circular 1878; J.D.B. circular 69; 

 Y.N.U. 1903). Scorborough Beck (H. M. Foster). 



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

 Driffield (L. B. Ross J. of C. 4, p. 356). Not found in the east of 

 Holderness (T. P. ). Generally in the streams, especially on the 

 Foston side of Driffield (E.P.B".). 



Velletia lacustris (Linn.). 



Rare in the East Riding - ; the specimen recorded below is 

 the only one I have taken. 



Derwentland. — Ditch along the Ouse between Selby and Barlby (Y.N.U. 

 1875). River Derwent at Kirkham Abbey (Y.N.U. 1889). 



Wolds. — Flamborough (F.W.F. circular 116). Speeton (W.C.H., 

 " Flamborough " p. 137). 



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

 canal (J.D.B. 1). Leven canal and Leckonfield Moat, fine and 

 moderately abundant (J.D.B. 3). Hornsea (Y.N.U. 1881; F.W.F. 

 Fretwell's Guide ; a dead shell on a caddis case, May 28, 1904, 

 T.P.). Pond on roadside between Sutton and Wawne (H. E. 

 Johnson). Ponds near Swine Church (F.W.F. and J. F. Robinson). 

 Common on reeds of canal at Wansford ; ponds at Skerne (E.P.B). 



[Cyclostoma elegans (Mull.). 



Is reported for Forge Valley, but has not been recorded 

 for the East Riding]. 



[Acme lineata (Drap.). 



Occurs at Hackness (W.C.H.). Not on record for the 

 East Riding]. 



Neritina fluviatilis (Linn.). 

 Much rarer than might be expected, considering the 

 number of streams in the Riding. 



Derwentland. — York: "In vadis lapidosis fluviis Ouse juxta Fooforth 

 copiose" (Dr. Martin Lister, Hist. Animalium Angliae, p. 136; 

 Hincks, Ann. Nat. Hist. ser. I. 5, 1840, p. 367 ; abundant in the 

 Ouse on stones two or three feet below the surface (S.W.N. ) ; Ouse 

 near Bishopthorpe, a very dark variety (W.C.H.); very abundant 

 in the Ouse both above and below the city (R.M.C.). Derwent 

 near Kirkham Abbey (W.C.H. in N. & T.). 



