146 



Limnaeus glaber more closely resembles Limnseu* 

 truncatulus than any other species. It is considerably 

 more elongated, the mouth very small aad acutely oval, 

 spire gradually tapering to a point. It is shining, pale 

 horn-coloured, and brittle. There are from seven to 

 nine rounded convolutions. 



Length usually five-eighths of an inch; and breadth 

 three lines. Occasional examples are as much as an 

 inch long. 



Animal dark grey or blackish. 



Found in still waters, and by no means a common 

 shell. 



Described first by Pennant, in his " British Zoology," 

 in the year 1777. 



One specimen only has been found in this neighbour- 

 hood ; it was dredged in the River Leen, at Bulwell, a 

 very singular locality. 



The following are recorded localities: — Penzance, 

 Cornwall, where it is plentiful (Millett), Swansea, Car- 

 diff, and Manorbeer (Jeffreys), Wiltshire, Somerset- 

 shire, and Staffordshire (Forbes), York, rare, (Hincks), 

 Clitheroe (Recce), London (Grey), Kendal, one locality 

 (Gough), Newcastle (Alder). 



Rare in Ireland (Forbes), near Dublin (Brown), Bel- 

 fast (Thompson^, Cork (Humpbrys. I am not aware 

 that it is found in Scotland. 



On the continent, in France (Draparnaud), Germany 

 (Pfeiffer), and Sweden (Nilson). 



Specimens have been received from Penzance from 

 R. T. Millett, Esq., and from Swansea from J. G. Jef- 

 freys, Esq. They da not differ much in different 

 localities 



Mr. Morris has found it fossil in the fresh-water 

 deposits in the valley of the Thames, near London. 



