35 



Other localities are, Bristol and Wiltshire (Montagu), 

 the river Thames (Grey), the rivers Ouse and Humber, 

 with their tributaries (Forbes), the rivers Severn aud 

 Avon (Forbes), Surrey (Millett), near Scarborough, 

 although rare (Bean), Swansea (Forbes), the rivers 

 Bela and Lune (Gough), the Lune at Skerton Bridge, 

 near Lancaster (Howitt), and in Blenheim Lake (Mrs. 

 R. Smith). In Ireland, in the rivers Liffey, Shannon, 

 and Lee (Thompson), Dublin (Brown). In Scotland it 

 is doubtful whether it is to be found as an inhabitant, 

 although, strange to say, it is described by Professor 

 Forbes as being found in the Loch of Stennis, in the 

 Orkney Islands. 



Abroad, it is an inhabitant of the Baltic Sea (Forbes), 

 Germany (Pfeiffer), Sweden (Nilson), generally dis- 

 tributed through central, and in parts of northern and 

 southern Europe (Forbes). 



Professor Forbes informs us that, as a fossil, it 

 occurs in the fresh-water deposits of the oolitic period. 



The shell soon dies when kept in confinement. 



P.ALUDINIDCE. 



A small family of univalve fresh-water mollusca, 

 embracing the divisions of Paludina, Bithinia, and 

 Valvata, each of which is furnished with an operculum, 

 formed for the most part of concentric-lamince, extended 

 around a nucleus which is not always situated in the 

 centre of the operculum. 



Paludina. 



This branch of the family of Paiudinidoe take the 

 name of Paludinoe from frequenting ditches and 

 marshes. 



