131 



Localities in Nottinghamshire — Musco-sie dike, small 

 pools and brooks in Lenton,Beeston, Beeston Ryelands, 

 and Radford. 



Amongst the many other localities may be mentioned 

 Essex (Sheppard), London (Grey), River Thames, at 

 Guilford (Millett), River Waveney, near Shotford 

 Bridge, Northamptonshire (Bloxam), River Eylhrope, 

 at Stone, Buckinghamshire (Reade), Norwich (Bridg- 

 man), Kendal (Gough), Newcastle (Alder). Ireland 

 (Thompson^. Scotland (Fleming). 



Widely distributed on the continent (Forbes), France 

 (Draparnaud), Germany (Pfeifter),and Sweden (Nilson). 



Planorbis carinatus [The Carinated Coil Shell]. 

 Muller. 



Fiffure 94, 



First diseribed by Montagu, in 1803. 



A nearly smooth, well polished, shining, semi-trans- 

 parent shell, with five well divided and rapidly enlarg- 

 ing convolutions. The outer edge of the body whorl is 

 furnished with an obtuse keel. Lower disc flat, upper 

 disc profoundly concave in the middle, and forming an 

 umbilicus. Horn-coloured. Aperture rhomboidal, 

 and angulated laterally. 



Usual breadth half an inch. Individuals in this 

 neighbourhood rather exceed this size. 



Colour of the animal, brownish. 



