R. STANDEN : LAND AND FRESHWATER MOLLUSCA. 



163 



Planorbis dilatatus Gould. Mr. Thos. Rogers informs me that this 

 species is now very abundant in the Gorton Canal, and thousands, 

 which had congregated in the interstices of a wall, were last year 

 destroyed by the wall being repaired and ' pointed.' Mr. F. C. 

 Long has recently discovered it in great abundance in a pond 

 near a paper mill at Burnley. Mr. Thos. Rogers says ' these 

 are larger and stronger in the shell than any ' he has taken. 



Planorbis spirorbis Miill. Not very plentiful about Birch, Prestwich, 

 Swinton, Crossens, and Farrington. Plentiful at Hesketh, where a 

 fine scalariform, and several curiously distorted specimens were 

 taken by Mr. Heathcote. It occurs in vast abundance in some 

 narrow ditches at Farrington. Ightonhill, Burnley (F.C.L.). 



'Pits, &c., plentiful. In many places abundant' (Hardy's 

 List, 1865). 



' Found in nearly all the old pits near Cheadle ; also in the 

 ditches of Moss Lane, Greenheys ; and in the neighbouring pits 

 of Heywood's Farm ; in all which localities they are very clean. 

 Also in Hough-end-Clough ' (Dyson's List, 1850). 

 Planorbis vortex L. Tarleton, Birch, Pendlebury, Worsley, Clifton, 

 Newsham, Crossens, and Banks, but is not quite as common as 

 the preceding species. 



' Common throughout the district, amongst the vegetation of 

 pits, &c.' (Hardy's List, 1865). 



' There is scarcely a pit in Chorlton Fields that does not 

 contain this species, and the same may be said of other pits in 

 almost every direction out of Manchester. It is common in the 

 ditches on Freckleton Marsh' (Dyson's List, 1850). 

 var. compressa Lloyd. One at Farrington, 1887. 

 Planorbis carinatus Miill. Very plentiful in Drinkwater Park, 

 Prestwich. Not common at Birch, Clifton, Tarleton, and 

 Newsham. Occurs in canal at Burnley (F.C.L.). 



Plentiful in pits at Newton heath (T.R.). 



' Common throughout the district, in pits and ditches ' 

 (Hardy's List, 1865). 



' In an old pitstead, Harpurhey ; in the Nine Pits, Chorlton 

 Fields. Common in many ponds all about Manchester' (Dyson's 

 List, 1850). 



Planorbis complanatus L. Common in the mill dam, Cadley, near 

 Preston, where some fine specimens measuring nearly an inch 

 in diameter have been obtained by Mr. Heathcote. A few 

 specimens have been obtained at Prestwich, Burnley Canal 

 (F.C.L.), and Clifton. Haslingden (H. Stephenson). 

 Very fine in pits near Eccles (T.R.). 



June 1887. 



