LAND AND FRESH WATER MOLLUSCA OF THE EAST RIDING. 141 



The following have also been recorded : — Shell straw colour with 

 white bands, Brough (J.D.B. 1). With straw coloured bands, 

 Bridlington (W.D.R., J. of C. 5, p. 134). Var. citronozonata, chalk 

 pit on the Wolds (W. Gyngell, loc. cit.). Var. petiveria, Wressle, 

 common with and without bands (G.R). Var. trochoides Clessin, 

 Wressle (G.R. )• The common colours in Holderness are libellula 

 and rubella; I have olivacea from Hedon (T. P. ). 



Helix hortensis Mull. 



The recorded stations suggest that the distribution of 

 this species is determined by altitude, though it is found 

 at low elevations in other districts. It is apparently common 

 near York and in the central division, but is only known 

 to occur in Holderness on the western edge at Beverley and 

 Cottingham, though it has been carefully looked for else- 

 where. Probably some of the records refer to H. nemoralis 

 var. albolabiata. 



Derwentland. — York district, common (S.W.N.) : more abundant than 

 nemoralis (R.M.C.). Fulford (W.C.H. in R.M.C.). 



Wolds.— Settrington, near York (H. Pollard, Nat. 3, p. 44). 

 North Grimston, a few (Y.N.U. 1902). Sledmere (Y.N.U. 1891); 

 my specimens are nemoralis albolabiata (T. P. ). Kildwick Percy 

 (Y.N.U. 18S5; circular 106). Filey (Y.N.U. 1883). Bempton 

 (J.S.G). Speeton and Flamborough (W.C.H. circular 62 ; T.P. 

 circular 172). Not east of Bridlington Quay (W.C.H. "Flam- 

 borough" p. 135). South Cave, var. lilacina (F.W. F. circular 111). 

 Welton Dale (F.W.F. circular 157; Y.N.U. 1901). Skidby 

 (J.D.B. 1). Not common; King's Mill, Driffield; Bainton ; Kirkburn 

 Road, Tibthorpe ; Lund Wold (E.P.B.). North Cave, with var. 

 lilacina (T.P.). 



Holderness. — Cottingham, var. castanea 00000 (F.W.F. J. of C. 6, p. 

 306; p. 398). Beverley (J.D.B. 1); extremely abundant in Pighill 

 Lane, Long Lane, Queensgate Road, Cherry Tree Lane ; in Pighill 

 Lane a series of specimens may sometimes be found running by 

 fine gradations from this species to nemoralis ; H. hortensis var. 

 hybrida, Pighill Lane, perhaps not quite typical but intermediate 

 between hortensis and nemoralis (J.D.B. 3). Hedon Railway 

 Bridge (T.P. Trans, i., p. 101) recorded in error. Clough Road, 

 Newland (J.W. B.). Cottingham, New Village, and banks of 

 Cottingham Beck, with var. lilacina (J.W. B.). Kilnsea, one 

 specimen (Y.N.U. 1904). 



Helix arbustorum Linn. 



Like the last species, this is rare in the eastern division 

 except at Beverley and Cottingham. References to J.W.T. 

 here refer to Mr. Taylor's "Life history of H. arbustorum " 

 (J- of C. 5, pp. 241-259, and 302-305). The altitudes given 

 require correction in many cases, thus Bubwith is about 

 20 ft., but it is certainly more abundant in the central 

 division than in the less elevated districts. 



