420 



give It a diflinft place, though we are much inclined to 

 believe it a different fpecies. It is more pellucid, the 

 apex more produced, and never has that opaque green- 

 ifli colour at the bafe : that found under water (which 

 we take to be Schroeter's fig. 32) was of a light, 

 tranfparent horn-colour. Others, taken in wet drains 

 and ditches about Nctobury in Berkjliire, are of a rufous 

 horn-colour, (which is probably Schroeter's fig. 33) : 

 the animal is black, and when alive, gives the fhell a 

 deep chocolate-brown colour. This lafl we have alfo 

 found on a fwamp, in a wood belonging to Lord Clif- 

 ford in Devonjliire, rather lighter in colour. 



We are aware that the colour of fliells is fome- 

 what afifefted by the foil, at leaft fuch as live in moift or 

 Av^atery places : thofe found at Newbury are doubtlefs of 

 a darker colour, from partaking of the foil, which is 

 peat. 



This lafl never exceeds a quarter of an inch in 

 breadth. That found under water, was crawling upon 

 brooklime, and was confiderably larger : it v*'as in a 

 water-courfe, or drain to a fwamp, near Penzance in 

 Cornwall. Thefe, however, appear from their (liape 

 to be the fame, but whether t-hey are really diftinft from 

 the lucida, or only varieties, the obfervations of future 

 conchologifls muft determine. We do not recollefl, 

 whether the animal of that we found under w^ater, was 

 of the true aquatic kind, or whether it polfeffed four re- 



tradile 



