SECTION I. ij 



though fuch different Shells may be in- 

 habited by the fame kind of fiili, to wir, 

 a Limax or SnaiL And therefore, though 

 the Llmax or Fijh is of the very fams 

 kind, and forms or fixes the genus, yet 

 the Shells, always conftant, will fix or 

 define the fpecies of that fame genus. 

 An analogy to this bears ftrong through 

 all the Animal kingdom ; for fpecies of 

 Quadrupeds are diflinguilhed and defined 

 in their genera, from the different colours 

 of their hides ; Birds by their various 

 plumage ; and Infects by their different 

 colourings. Therefore, why (hould not 

 Shells, which wear fuch ftrong characters, 

 by the fime parity of reafon, form fpecies 

 of the iame genus ? or, in other words, 

 why (hould not the fame fifh, or genus, 

 yield many diff'erent fpecies, according to 

 the feveral charadteriftical differences of 

 its Shells or habitations ? 



I have allowed that Shells in their dif- 

 ferent growths vary exceedingly, even 



G fo 



