S E C T I O N I. 23 



tended, very thick, pronged or fet with 

 large fpikes, and almoft doles their mouth 

 or opening. Yet even all thefe Shells, 

 either in the turban, body, tip, work, 

 or colour, have conftant and fixed cha- 

 rafters, which diftinguifli them through- 

 out all thefe extremely different appear- 

 ances. 



It is needlefs to enumerate other in- 

 Aances; they will occur in the feveral 

 claffes, as we proceed. I .w ill therefore 

 clofe this fubjeft with the following 

 reafoning ; viz. Granted that the various 

 growths or ftages of the inhabitant ani- 

 mals change the forms and colours ci 

 the Shells fo very greatly ; it evidently 

 enfues, that the animals themfelves muft 

 undergo as material changes in their 

 forms. It cannot be otherwife ; for the 

 Shell muft always anfwer to the animal, 

 and its ways of life ; therefore, if great 

 changes happen to the animal as well 

 as to the Shell, we remain in equal un- 



C 4 certainty 



