178 LAND AND FRESH-WATER MOLLUSKS. 



Pisidium Henslowianum. — One specimen, canal at Chalford, 



Pisidium amnieum. — Not unfrequent in same locality, 



Pisidium cinereum?— Springeye on Minching Hampton Common, and one or 

 two of the smaller varieties, which I have not yet been able to make out. 



Anodon. — Several young specimens; but I had no opportunity of dredging, 

 to find out to what variety they belonged. 



Dreissena polymorpha. — Canal at Chalford. 



Upton Hall, Birkenhead. May '[st., 1854. 



LIST OF LAND AND FRESH-WATER 



MOLLUSKS FOUND IN THE NEIGHBOURHOOD OF 



ACKWORTH,* YORKSHIRE. 



BY CHARLES ASHFORD, ESQ. 



Nomenclature, Gray's Turton's British Shells, 



Bithinia tentaculata. — Abundant: invai'iably covered with an earthy incrus- 

 tation. 



Valvata piscinalis. — Abundant at Wintcrset, (five miles S, W, :) common 

 here. 



Arion ater. — Common: of several shades between black and russet brown. 



Limax maximus, — Common, but generally not so large as I have seen them 

 in other districts. 



Limax carinatus, — Several specimens once found on a stone wall after a 

 wet day. 



Limax agrestis. — Superabundant. 



Vitrina pellucida. — Of frequent occurrence in early spring, at bottom of 

 hedges among wet leaves, etc. 



Helix aspersa. — As everywhere, common and voracious. 



Helix hortensis, — Occasionally found here. 



Helix hybrida. — ^Rare; one good specimen found a few days ago. 



Helix nemoralis. — Common, One specimen was found marked with rich 

 irregular mahogany-like blotches instead of bands. 



Helix lapicida. — Tolerably abundant among the fissures of the limestone 

 rocks at Went Vale, 



Helix pulchella, — Pretty common. Specimens of v, Imbricata have been found 

 in dry as well as marshy situations, (See Turton, p. 142.) 



Helix Cantiana, — Common but local, being confined to a few hundred yards 

 of hedging. 



Helix fusca. — Not found nearer than the woods by Doncaster, and can 

 hardly be said to belong to this neighbourhood. 



Helix fulva. — Tolerably common at roots of grass in damp situations. 



* Ackworth is situated on the borders of the Sandstone of the coal measures, with the Mag- 

 nesiau Limestone and New lied Sandstone within two or three miles. 



