OLDHAM : LAND AND FRESHWATER MOLLUSCA OF CHESHIRE. 1 27 



and Oldham). Ellesmere Canal, Bickley; Canal, Lostock 

 Gralam ; Peak Forest Canal from Hyde to Whaley Bridge. 



Pisidium amnicum v. flavescens Moq. Canal, Congleton 



(E. Collier, 'J. of C./ vol. iv, p. 153); Peak Forest Canal, New 

 Mills and Woodley. 



Pisidium fontinale (Drap.). Common and universally distributed. 

 Varies considerably in form and colour. 



Pisidium fontinale v. cinerea Alder. Pond> Bidston Hill 



(Byerley fide Brockholes and Warrington). Manley (Nixon 

 Coll.). Lostock Gralam, Mobberley, Kelsall, Lyme Park. 



Pisidium henslowanum (Shepp.). Not uncommon in canals and 

 ponds. Pond between Upton and Saughall-Massie (Byerley 

 fide W. Webster). Hale Moss (Hardy). Mere, Brooklands, 

 Heyhead near Ringway ; Baguley (Milne and Oldham). Hand- 

 forth, Poynton, Marple Park, Over Tabley, Ellesmere Canal at 

 Bickley, Peak Forest Canal from Woodley to New Mills. 



Pisidium pulchellum Jemyns. Brownlow Green near Northenden 

 (Milne and Oldham). Curzon Park, Chester (Chester Museum 

 Coll.). Moreton (W.J.F.). Marston near Northwich ; Knuts- 

 ford, Cutting between Pickmere and Budworth Meres. 



Pisidium pusillum (Gmelin). Abounds everywhere. Varies 

 greatly in size, form and colour. 



Pisidium pusillum v. obtusalis (Lam.). Ditch, Baguley; Oak- 

 mere, Cutting between Pickmere and Budworth Meres. 



Pisidium nitidum Jenyns. In swampy places near Baguley Hall 

 (Milne and Oldham). The hot summer of 1893 dried up these 

 swampy places, and I have been unable to find specimens since 

 then. Elsewhere I have only seen this species from Upton 

 near Chester, whence Mr. J. B. Tomlin has kindly sent me 

 specimens. 



Pisidium milium Held. The older collectors seem to have over- 

 looked this well-marked species, which is widely distributed and 

 not uncommon. Baguley, Sale, Northen Etchells, Ashley, 

 Mere (Milne and Oldham).' Oxton (W.J.F.). Poynton, Adling- 



ton, 



bet 



Mould 



near Malpas ; Bredbury, Romiley, Marple Park, Kelsall. 



Faro. MYTILID.E. 



Dreissensia poiymorpha (Pail.). Both Bellars and Byerley 

 record this species from the Ellesmere Canal; Mr. Tomlin 

 states that it swarms in this canal at Chester, 'especially under 



April 1896. 



