46 JOURNAL OF CONCHOLOGY. 



NOTES ON 



THE LAND AND FRESHWATER MOLLUSCA OF 



THE LOWER TEES. 



By baker HUDSON, M.C.S. 



[Read before the Conchological Society.] 



In the Journal of Conchology (vol. ii., p. 236 et seq.), Mr. Chas. 

 Ashford gave a list of the Land and Freshwater Shells, observed 

 by himself during the early part of 1879, supplemented by notes 

 by the Rev. W, C. Hey and my friend Mr. J. W. Watson. 

 Mr. Ashford has suggested to me that I should embody my own 

 observations of the Mollusca of the Lower Tees and immediate 

 district, in a supplemental list. In the interests of our Society 

 I have thought it well to adopt Mr. Ashford's suggestion, and I 

 now beg to offer the following, not indeed as completing the list 

 for the district, but in order to bring it up to date. 



I have met with nearly all the species, recorded in Mr. 

 Ashford's list, in other localities, but confine my notes to those 

 species and varieties not included in that list. 



Helix arbustorum L. — This is a decidedly woodland species 

 with us, but though local, is not uncommon where it occurs. 

 I have taken it near Guisborough, at Skelton, Saltburn, 

 Wilton, and Thornaby. 



H. hortensis Mull. — Until recently I believed that this shell 

 did not occur in the delta of the Tees (by " the delta " I 

 mean the flat alluvial lands lying between the Cleveland 

 Hills and the Durham Hills above Greatham). I have 

 however recently taken it at Thornaby, — and a week ago I 

 found a broken shell near a thrush's altar in Airey Holme 

 Wood, which belonged to the var. lufea. It also occurs 

 sparingly near Skelton, and in the vicinity of Stokesley. 



H. virgata var. albicans Grat. This variety is even more 

 abundant than the type on Coatham Sand Hills. It 



J.C, v., April, 1SS6. 



