590 



In a recent vifit to the neighbourhood where this fhel 

 was difcovered in the year 1798, (Iritl fearch was made, 

 with a view to afcertain if it had fpread ; but akhough a 

 great many were obferved of all ages, in the fame muddy 

 pool, on the fide of the high road, upon the top of a 

 hill; not one could be found in fimilar fituations, either 

 contiguous, or in any other parts of the country. From 

 thefe we renewed our cochlear iwn, the firft colony hav- 

 ing failed, probably from the different nature of the 

 waters. 



AsPF.RSA. Helix hortenfis. Dotu Br, Shells, iv. t. 131. 



p. 407. 



ALPHA. 



