50 HELICIDJE. 



and thirdly by the peculiar localities which it frequents. 

 The whorls are five in number, quickly enlarging, 

 which gives it an oval, or irregular spindle shape. 

 Animal dark, shining ; upper tentacles thick and short, 

 lower ones almost imperceptible, mere dots. 



Hob. Marshes and other wet places ; the muddy 

 sides of slow streams, canals, &c. It is widely distri- 

 buted, rather local, but sometimes plentiful. It has 

 been found near Swansea, Bath, Bristol, Cheltenham, 

 &c. ; also near Oxford and many places in the south of 

 England. 



P. PUSILLA. Mutter. PL VII, fig. 13. 



Shell cylindrical, minute ; mouth sinistral, with six to eight teeth ; 

 peristome thin. 



Vertigo pusilla, Gray. 



By being sinistral this shell is at once distinguished 

 from the remainder of the genus, except Venetzii, from 

 which it may be distinguished by being much larger, 

 and having the aperture larger, and of a semi-oval 

 shape. Pusilla is transparent, glossy, and of a pale 

 chestnut colour. The mouth is armed with six or 

 seven teeth, and one is sometimes appended to the 

 pillar lip. Animal dark grey, pale underneath. 



Hob. Among damp moss, under stones, &c. It is 

 widely diffused, and in some places pretty abundant. 

 Walls at Woodeaton, near Oxford, and many other 

 districts in the southern and eastern counties ; Went 

 Vale, near Ackworth, and other localities in Durham, 

 Northumberland, and Westmoreland. Rare in Ire- 

 land. 



P. VENETZII. Charpentier. PL VII, fig. 14. 



Shell very minute, sinistral, pale amber colour, teeth four or five. 

 Vertigo aiigustior, Gray. Turbo vertigo, Mont. 



This rare shell has only been discovered in a few 

 localities, in the British Isles. It is very minute, thin, 

 and not shining. Its little, short, thick-set whorls, 



