SECTION!. 15 



be open to fome confufion and error in this 

 branch of natural knowledge. 



Mr. Adanfon obferves, with great pre- 

 cifion, that the dirterence of the Shells of 

 this kind was fo extremely great, that he 

 fhould not have hefitated to pronounce 

 them difiiincL fpecies, had he not found 

 the fame animal in them all. Indeed a 

 fcrutinylnto the different Shells he quotes 

 to be of this one fame kuid is amazing, 

 for hardly one of them agrees with the 

 others : for, befides this Libot or Black 

 Limpet ^5 he alio joins with it the Tljorny 

 Limpet S the Beauty \ and the JJiroIepas 

 Limpets ^-^ all as of the very fame fpecies; 

 wdiich Shells have not the leaft refem- 

 blance to each other, 



^ Patella nigra, Anonymoiis New Concliolcgv, 

 Pi. I. %. 8. p. 5. N=8. 



^ Patella echinata, Id. PI. 3. fig. i-:;. p. jS. N"* 13. 

 ^ Patella pulchra. Id. PI. 2. %. 8. p. 12. N= 8. 

 1 Ailrolepa?, Id. PI. 3. %. 2. p. 14. N"* 2. 



Obfer- 



