127 



Ri?er Wa?eney, near Sbotford Bridge, Northampton- 

 shire (Bloxam), River Eythrope, at Stone, Bucking- 

 hamshire (Reade), Darlington (Alder). 



In Ireland, in Queen's County (Rev. B. J. Clark), 

 Maynooth and Dublin (Capt. Brown), and Naas (Dr. 

 Ball). Not Found in Scotland (Forbes). 



In France (Draparnaud), Germany (Pfeiffer), Swe- 

 den (Nilson. 



Found fossil in mammaliferous crag on the banks of 

 the Thames, near London ("MorrisJ. 



Planorbis albds [The White Coil Shell]. MUller. 

 Figure 91. 



Described by Peliver, in his ** Gazophylaciiim." 



It has four to fi»e rounded and deeply divided convo- 

 lutions, marked with strong longitudinal strioe and 

 deciduous bristles. Both discs are convex. Thin, 

 fragile, pale horn-coloured, with a large and nearly 

 white aperture, of an oboval-Iunate form. 



Diameter usually from a fourth to a fifth of an inch. 

 The specimens from Scarborough measure three and a 

 half lines in diameter; those from HigLfield House 

 three lines; whilst those from Penzance do not exceed 

 two lines and a half. 



Animal usually grey, but very varied in diflerent 

 localities. 



A common species throughout Great Britain and 

 Ireland; found in stagnant water and slow streams, 



