OLDHAM : LAND AND FRESHWATER MOLLUSCA OF CHESHIRE. I 25 



PELECYPODA. 



Fam. UNIONlDsE. 



Unio tumidus Phil. Rare. Canal, Chester (Chester Museum 



Coll.). 



J-). Sparingly in the 



same canal at Marple ; very fine specimens with brown epidermis 

 in Budworth Mere near Northwich. 



Unio pictorum (L.). Rather more common than the last species. 

 River Weaver near Northwich (Dyson). Canal, Chester (Bellars). 

 Peak Forest Canal, Disley (K.H.J. ). Plentiful in the same 

 canal at Marple Locks, which has long been known as a station 

 by Manchester collectors ; Bar Mere near Malpas. 



Unio pictorum v. curvirostris Norm, Peak Forest Canal, 



Disley (K.H.J.). Plentiful in the same canal at Marple. 



Anodonta cygnea (L.). Plentiful throughout the county in canals, 

 streams, ponds, and meres. In the Chester Museum is a 

 specimen 8J inches in length, which was taken from a pond at 

 Mollington in August 1887. I have collected shells from 

 Pickmere Mere which are identical with those from Combermere 

 Mere, figured by Captain Brown (* Illustrations of the Eand and 

 Freshwater Conchology of Great Britain and Ireland'), and 

 erroneously referred by him to A. piscina lis Nilss. 



Anodonta cygnea v. arenaria (Schroter). Baguley, Over Tabley 



(Milne and Oldham). Budworth Mere near Northwich. 



Anodonta cygnea v. incrassata (Shepp.). Baguley, Brook- 

 lands, Northern Etchels (Milne and Oldham). Lymm dam. 



Anodonta anatina (L.). Less common than the last species. 



Canal, Chester (Bellars). Curzon Park, Chester (Chester 

 Museum Coll.). Brook flowing from Rostherne Mere (Milne 

 and Oldham). Peak Forest Canal, Disley (K.H.J.). Plentiful 

 in the same canal at Marple Locks. 



Anodonta anatina v. rostrata Brot. Bar Mere near Malpas. 



Anodonta anatina v. elongata Brot. In the Peak Forest 



Canal at Marple there occurs with the type a very distinct 

 form which Mr. G. S. Tye refers to this variety, although he 

 does not consider the shells quite typical. 



Fam. SPHAiRIIDAL 



Sphaerium corneum (L.). Very common in canals, ponds and 



running water. 



Sphagnum corneum v. pisidioides Gray. Pond, Rostherne 

 (Milne and Oldham). 



April 18&6. 



