THE FAUNA OF LIVERPOOL. 

 MoNTACUTA BiDENTATA. 



Two living specimens, dredged in the " swasb," between Hojlake and Hilbre. 



Family CYCLADID.i:. 

 Genus CYCLAS. 

 Cyclas Rivicola. 



In the canal neai' Liverpool. Also in the Ellesmere and Chester canal. 

 — Mr. Cameron. Very abundant. 

 Cyclas Coenea. 



In most ponds. They vary greatly in size and shape in different localities. 

 The variety described under the name of " Cyclas Citrina," by Captain 

 Brown, has been found in a pit at Upton by Mr. Webster. 

 Cyclas Caliculata. 



In ponds near Upton. In a pond at the Carr, near the ToUgate, on the Hoy- 

 lake road, and many other localities, but much less general than the former 

 species. Pits near Zoological Gardens. 



Genus PISIDIUM. 



PiSIDIUM PUSILLUM. 



Not uncommon in ditches and ponds. 

 PiSmiUM CiNEREUM. 



In a small pond upon Bidston-hill.— il/fssrs. Brnckhoks and Wurrington. 

 Bootle. In a pond between Upton and Woodchurch, by the fields. 



PiSIDIUM PULCHELLUM. 



In ponds and ditches generally. 



PiSlDIUM HeNSLOWIANUM. 



In a smdl pit between Upton and Sanghall-Massie. — Mr. VTebster. 



Family UNIONID^. 

 Genus ANODONTA. 

 Anodonta Cygnea. 



The variety " Cellensis" of Brown, very common and large in pits. . 



Variety " Complanata," in a brook below Greasby, Cheshire. 



Variety " Avonensis ? " in the Ford brook between Bidston Hill and Upton. 



Scaice. 

 Another variety, probably " Bouderosa," but difficidt to refer, more common 

 than any others, and found in most of the pits in Wirral. Otterspool, 

 Aigburth. is mentioned also by Brown as a locality for this variety. 



Family MYTILID.E. 

 Genus DREISSENA. 

 Dreissexa Polymorpha. 



In the Ellesmere, Leeds, and Livei-pool Canals.— 3/r. Cameron. 



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