133 



row, deeply divided convolutions, the body whorl of 

 which is very little larger than the preceding one. 

 Apertare oblique and angulated. 



Usual diameter from three to four lines ; it occasion- 

 ally reaches five lines near Nottingham and in the vale 

 of Aylesbury. It is very small and poor, both at Pen- 

 zance and Kendal. 



Animal grey^ with a leaden-black head. 



An inhabitant of stagnant water and slow streams. 

 Can be kept a considerable time out of water, for in its 

 ordinary localities, small ditches and swamps, the sum- 

 mer's sun dries them up, leaving the shell without 

 water. On these occasions the aperture is closed with 

 a white epiphragm^ and the animal remains dormant 

 until rainy weather re-fills the ditches. 



Procured plentifully in dikes in the parishes of Bees- 

 ton, Attenborough, Radford, Bulwell, and Stanton-on- 

 ^he- Wolds, the Trent at Beeston, the Leen at Bulwell, 

 under the Seven Arches in Nottingham Meadows, and 

 in the lake at Highfield House. 



A few distant localities will suffice to illustrate its 

 wide range: — Penzance (Millett), Bristol (Miller), 

 Wiltshire (Montagu), Essex (Sheppard), London 

 (Grey), Northamptonshire and Derbyshire (Bloxam)' 

 Hartwell Park, Buckinghamshire (Lowndes), Stone, 

 Buckinghamshire (Retide), Norwich (Bridgman), Ken. 

 da), one locality (Gough), Dumfrieshire (Sir W. Jar- 

 dine), Aberdeen (Macgillivray), 



Ireland (Thompson), Scilly Islands (Millett). 

 France (Draparnaud), Germany (Pfeiffer), Sweden 

 (Nilson). 



Found fossil near London (Morris) 



