139 



Shell \\rinkled, somewhat ovate, polished, horn- 

 coloured, spire very small, brittle, transparent, and thin. 

 The aperture capacious, "with a strong columellar fold. 

 There are from four to four and a half convolutions. 



Length an inch, breadth three quarters of an inch. 



The animal is very similar to that of L. pereger, 

 being dull greenish yellow. 



Inhabits stagnant or slow waters. 



It was first described by Dr. Lister, in the year 1678. 



A widely spread, though local shell. 



It lays from 60 to 100 eggs, which hatch in little 

 more than a fortnight. 



In this neighbourhood it is found in the Musco-sic 

 dike near Beeston, the River Trent in still places, the 

 old canal at Wollaton, and in Clumber lake, according 

 to Mr. Jeffreys. 



Other localities are — Bristol (Miller), Kent, Dorset 

 shire, and Wiltshire (Montagu), Essex (Sheppard), 

 London (Grey), Norwich (Bridgraan), Swansea (Jef- 

 freysf. River Avon and Kiver Kennet, Berkshire (Brovv n), 

 Worcester, rare (Reece), River Waveney, near Shotford 

 Bridge, Northamptonshire (Bloxara), Hartwell Park, 

 near Aylesbury (Lowndes), River Eythrope, near Stone 

 (Keade), York (Hinks), Kendal, in the canal, scarce 

 and poor (Gough), Newcastle (Alder), Prestwick Car, 

 small, and at Darlington, Durham (Alder^. Abercorn 

 Park, Scotland (Logan), Ireland (Thompson). 



America (Grey), Germany (Pfeiffer), Sweden (Nil- 

 son), France (Draparnaud). 



Var. acutus. 



I feel strongly inclined to consider this a distinct 

 species. It is smaller, smoother, more polished, paler 

 in colour, outer lip of the mouth much stronger, very 

 much polished internally, longer for its breadth, apex 



