ashford: the shells of the "lower tees" district. 281 



Helix ericetorum Mull. Coatham sandhills (C. A.). 



H. rot un data Mull. General round Gt. Ay ton and Stokesley 

 (J. W. W.). 



H. pygmsea Drap. General round Gt. Ayton (J. W. W.). 



H. pulchella Mull. Widely distributed (C. A.). 



Bulimus obscurus Mull. Airyholme Wood (J. W. W.). 



Pupa ringens Jeffr. Airyholme Wood (J. W. W.). 



P. umbilicata Drap. General (J. W. W.). 



P. marginata Drap. Sandhills between Redcar Battery and 

 Marske, extremely abundant (C. A.). 



P. marginata var. edentula. Wilton Wood (C. A.). 



Vertigo antivertigo Drap. 



V. pygmsea Drap. Sandhills, Redcar (C. A.). Round Ayton 

 (J. W. W.). 



V. edentula Drap. Woods round Ayton & Stokesley (J. W. W.). 



Balia perversa L. Airyholme Wood (J. W. W.). 



Clausilia rugosa Drap. General (J. W. W.). 



C. laminata Mont. Round Ayton, but not common (J. W. W.) 



Cochlicopa tridens Pulteney. Airyholme Wood (J. W. W.). 



C. lubrica Mull. General in north of district (C. A.). General 

 in south of district (J. W. W.). 



Achatina acicula Mull. Rejectamenta of Tees near Middles- 

 brough after a flood (J. W. W., alien?). 



Carychium minimum Mull. Widely spread in north (C. A.). 

 General (J. W. W.). 



Acme lineataDrap. Airyholme Wood, once abundant(J. W. W.). 



