CONCHOLOGY. 



weak, being considered by some as a powerful restorative 

 in cases of Consumption. 



Several of the earliest writers upon Conchology, had 

 divided the Shells of the Sea from those of the Land, by the 

 distinguishing names of the Terrestrial and the Marine, but 

 this division is now overlooked by the circumstance of 

 several of them living alternately in fresh water, or Bays 

 of the Ocean, or in Rivers where the Tides occasionally 

 flow inwards and outwards. 



The Genus Pomacea does not form a very numerous 

 assemblage, and indeed has been most surprisingly over- 

 looked by most of our recent authors. Very few have 

 hitherto been found on the coasts of England, and those in 

 general very small. Its natural place is the next in order 

 to the Genus Helix, before mentioned; it approaches also 

 in some of its characters to the Genus Bulimus, Melania, 

 Ancilla, and several others which are without a beak, and 

 also reside generally in the fresh water rivers and lakes of 

 different regions. 



