123 



amongst algoeand confervae in the Trent between Bees- 

 ton and Sawley. 



More distant localities are — Bristol fMillerJ, Wilt- 

 shire CMontagu^, Essex (Sheppardj, Norfolk, and 

 Shotlbrd Bridge, Nortbaraptonsbire CBloxam^, Hart- 

 well Park, near Aylesbury CLowndesj, Stone, Bucking- 

 hamshire CReadeJ, Norwich (BridgmanJ, London 

 ("Grey^, Anglesea (Sowerby^. Chaigeley, nearClitheroe 

 fWinstanleyJ, Kendal ("Gough^, Newcastle CAlderJ, 

 Dublin and King's County CBrown^, and a variety on 

 Monavallach Mountain, near Kilmacthomas, Waterford 

 CLeach;. Isle of Man (ForbesJ. 



On the continent, in France (Draparnaud), Germany 

 (Pfeiffer), and Sweden (Nilson). 



Physa hypnorum [The Slender Bubble Shell]. 

 Linnceus. 



Figure 88. 



83. 



This shell, which was discovered by Petiver, at 

 Mitcham, in Surrey, is the Bulla hypnorum of Linnaeus, 

 Montagu, and Turton, and the Aplexus hypnorum of 

 Grey. 



It is an elegant shell, of a lengthened conical form, 

 with a produced but blunt apex. Polished, thin, 

 fragile, yellowish-horn coloured. Aperture of a lanceo- 

 late ovate form. Five produced and scarcely raised 

 convolutions. 



The usual length is half an inch, and breadth 2i lines. 



