SECTION IV, jr^ 



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SECTION IV. 



HITHERTO I have only treated 

 of Conchology in general: I (hall 

 therefore now proceed to the particular 

 parts, and begin with the feveral fyftems 

 or methods of Shells eftabliihed by differ- 

 ent authors ; and alfo lay before my 

 readers the arrangement I propofe, that 

 they may be able to judge how far any 

 deviations I make from thofe now efta- 

 blilhed are judicious or approveable. 



The mod general manner of the old 

 authors has been, to divide all Shells into 

 iimple, turbinated, and bivalve. It is 

 evident that this divifion is very erro- 

 neous, as it entirely excludes the mul- 

 tivalves. 



Succeeding 





