COOKE: ON THE MACANDREW COLLECTION. 38 1 



Pisidium fontinale Drap. var. cinerea Aid. Scarboro'. 



As P. cinerxum. 

 P. pusillum Gmel. Britain. 

 P. pusillum Gmel. var. obtusalis Pfr. Britain. 



As P. obtusale. 

 P. pusillum? Gmel. var. obtusalis Pfr. Bressa, Zetland. 

 P. nitidum Jenyns. Britain. 

 Uniotumidus Phil. No locality. 

 U. tumidus Phil. var. ovalis Mont. No locality. 

 U. tumidus Phil. var. No locality. 

 U. pictorum L. No locality. 



As Unio ovalis. 

 U. margaritifer L. (and pearls). River Tay. 

 Anodonta cygnea L. 



A. anatina L. 



Unable myself to see any specific distinction between 

 the two, I have simply recorded them and left the cards 

 in the collection as I found them. 

 Dreissena polymorpha Pall. Birmingham. 



Hundreds of specimens in situ on a piece of branch. 



GASTEROPODA. 



Fresh Water. 



Neritina fluviatilis L. Ireland. 

 N. fluviatilis L. Birmingham. 

 Paludina contecta Miill. Yorkshire, &:c. 



As P. Listeri F. & H., which name must be quite 

 given up. 

 P. vivipara I^. Lancashire, &c. 

 P. vivipara L. var. unicolor. River Lea. 

 Bithinia tentaculata L. Scarboro'. 



B. Leachii Shep. Battersea. 



