556 R. STANDEN : LAND AND FRESHWATER MOLLUSCA. 



Sphserium corneum L. More or less common in almost every sheet 

 of water examined. Very fine in the Leeds and Liverpool Canal 

 at Hesketh Bank, at Birch, Prestwich, Newsham, Goosnargh, and 

 Farrington. Canal, Burnley (F.C.L.). 



' Pits in Moss-lane, Greenheys. These are the only pits in 

 the neighbourhood that I am acquainted with containing the 

 true Cyclas cornea' (Dyson's List, 1850). 



' Pits, common ; very fine in pits at Seedley and Chorlton-cum- 

 Hardy' (Hardy's List, 1865). 



I am sure that the occurrence in 1841-46 was never 

 abundant (R.D.D.). 

 var. flavescens Macgill. Occurs in ponds at. Newsham, Redscar, 



Penwortham, and in the canal at Burnley (F.C.L.). 

 var. nucleus Stud. Three specimens from pond at Worsley. 

 var. pisidioides Grav. Pond at Clayton, near Manchester 

 (T.R.). 



SphaBrium rivicola Leach. Remarkably fine, and locally abundant, 

 in the Leeds and Liverpool Canal at Tarleton ; also in the same 

 canal at Burnley (F.C.L.). 



'Bolton Canal. Canal at Reddish' (Hardy's List, 1865). 



' Plentiful in the Leeds and Liverpool Canal at Burnley ' 

 (Dyson's List, 1850). 



It is curious that Dyson did not find this shell near Man- 

 chester. I recollect exulting in finding it for the first time about 

 i860 in the Gorton Canal. I never saw it in 1841-46. At that 

 time the canal at Warrington was our nearest locality (R.D.D.). 

 Sphserium lacustre Miill. Abundant in canal at Tarleton, in ponds 

 at Birch, and less common at Goosnargh, Crossens, Newsham, 

 and Drink water Park, Prestwich. Pond near Burnley (F.C.L.). 



' Canals, pits, etc., throughout the entire district. Very 

 plentiful and variable' (Hardy's List, 1865). 



'Found a little above St. Luke's Church, Cheetham Hill, in 

 a pit in the hollow of Clarke's Fields, on the right-hand side of 

 the footpath leading to Blackley. It is also found in some pits 

 behind the Bull and Punchbowl, on the Stretford Road, just 

 below the Botanical Gardens ; and in the mud of the pits 

 adjoining Ordsall Clough. There are a few in the Nine Pits, 

 Chorlton Fields, of a transparent bluish colour. These are 

 among the rarest shells in this neighbourhood ' (Dyson's List, 

 1850). 



In [841-46 this species was a scarce one, and a prize, though 

 to be found over a good range south of the town, in pits 

 amongst the rushes and grass roots (R.D.D.). 



Naturalist, 



