137 



M. Bouchard Chautereaux has observed that it lays 

 from four to eight eggs at one time, which produce 

 young in from ten to twelve days. 



Our localities are the lake at Highfield House and a 

 sheet of water at Radford Grove, in neither place 

 abundant. 



It is recorded as found at Bristol (Miller), Kent, Don 

 setshire, and Wiltshire (Montagu), Essex (Sheppard),. 

 London (Grey), Norwich, occasionally abundant on 

 confervoe TBridgman), River Eythrope, Stone, Bucking- 

 hamshire (Reade), River Waveney, near Shotfcrd 

 Bridge, Northamptonshire (Bloxam), Newcastle (Alder), 

 Cupar (Fleming), Scotland (Laskey), South of Scot- 

 land (Forbes). In Ireland, local, but widely diffused 

 throughout the island (Forbes). 



On the continent, in France (Draparnaud), in Ger- 

 many (Pfeitfer), and in Sweden (Nilson). 



Mr. Morris has found it fossil near London. 



A difficult species to keep alive in confinement. 



We are deficient of Planorbis lacustris [the Seg- 

 mentina lineata of Grey], a common but very local 

 species ; and Planorbis glaber [the Planorbis losvis 

 of Grey], a very local shell. 



It is possible that both these species may eventually 

 be found in Nottinghamshire. 



LlMN^US. 



An interesting and widely spread family, with fragile 

 shells, which are egg-shaped, or lengthened, thin, and 

 dextral. Mouth generally ovate. 



