240 . ASHFORD : LIST OF REDCAR T. & F. W. SHELLS. 



By extending the radius to ten miles so as to include 

 Roseberry Topping, Guisborough, Ayton, Middlesborough, &c., 

 but no part of co. Durham, the preceding list may be supplemented 

 by 2 5 additional species on the authority of Mr. J. W. Watson of 

 Redcar, and three others (marked W. C. H.) on the authority of 

 the Rev. W. C. Hey of Guisborough. 



Sphaerium lacustre Miill. Round Stokesley and Ayton. 



Pisidium fontinale var. cinerea. A running stream near 

 Guisboro'. A batch of the fine series from this stream, some of 

 them measuring 5f mil. in breadth, comprised the individuals 

 referred to by the Rev. L. Jenyns in Ann. Nat. Hist., Aug. 1858. 



P. amnicum Miill. Generally distributed in streams near 

 Roseberry. 



Anodonta cygnea L. Near Ayton. 



Neritina fiuviatilis L. Ballast hills near Middlesborough 

 (alien? C. A.) 



Valvata cristata Miill. Ditches; Great Ayton. 

 . Planorbis glaber Jeff. Ponds near Ayton. ^ 



P. spirorbis Miill. 



P. vortex L. I Thesefour species occur in several 



P. complanatus L. [ waters near Roseberry. 



P. contortus L. J 



Limnaea stagnalis L. Near Stockton-on-Tees. 



L. palustris Miill. (decollated). Guisborough (W. C. H.) 



L. glabra Miill. Ponds near Ayton. 



Ancylus lacustris L. Ponds near Ayton. 



Helix nemoralis var. hybrida. Coatham and Hutton 

 Rudby. 



H. rufescens Penn. Near Guisboro', Stokesley, Ayton, &c. 

 H. pygmsea Drap. Near Guisboro", Stokesley, Ayton, &c. 

 Bulimus obscurus Miill. Airy Holme Wood. 



J.C., ii., August, 1870 



