ashford: the shells of the "lower tees district. 279 



Planorbis vortex L. General in the district (J. W. W.). 

 P. complanatus L. General in the district (J. W. W.). 

 P. contortus L. General in the district (J. W. W.). 

 Physa hypnorum L. General in the district (J. W. W.). 



Coatham marshes (C. A.). Ditch by Old Railway, 



Coatham (C. A.). 

 P. fontinalis L. General in the district (J. W. W.). Ponds, 



Coatham (C. A.). 

 Limnaea peregra Mull. Common everywhere (J. W. W. and 



C. A.). A variety in Coatham marshes (labiosal) has a 



tendency to the puckered and expanded mouth of 



auricularia (C. A.). 

 L. Stagnalis L. Near Stockton-on-Tees (J. W. W.). "N. 



Yorkshire " (D. and W.) 

 L. truncatula Mull. General in south of district (J. W. W.). 



Common, Coatham marshes (C. A). 

 L. glabra Mull. Pretty general in south of district (J. W. W.). 

 Ancylus fluviatilis Mull. General in neighbourhood, Gt. Ayton 



(J. W. W.). Running stream near Redcar (C. A.). 

 A. lacustris L. General round Ayton (J. W. W.). 

 Arion ater L. Generally round Redcar (C. A.) and probably 



throughout. 

 A. hortensis Fer. Redcar (C. A.). 

 Limax agrestis L. Everywhere (C. A.). 

 Succinea putris L. General in south of district (J. W. W.). 



Coatham marshes and Redcar sandhills (C. A.). 

 Vitrina pellucida Mull. General in south of district (J. W. W.); 



and in the north (C. A.). 

 Zonites cellarius Mull. Generally distributed, under stones, 



etc. (C. A. and J. W. W.). 

 Z. alliarius Miller. Coatham Whin, Yearby Wood and Wilton 



Wood (C. A.). Airyholme Wood (J. W. W.). 



