SECTION IV. pr 



the third family is the tubular Univalves ; 

 as Vermiculi, Dentalia, &c. 



Though Mr. Adanfon only treats of the 

 teftaceous animals of Senegal, and confe- 

 quently is a partial writer, or one that 

 does not give an intirc fyftem or Method 

 of Shells, I cannot withhold mentioning 

 him, as he is very remarkable. He ranges 

 all thole he exhibits by the animals them- 

 felves, and not by the (hells or fpoils: 

 however, he gives ten tables of affinities 

 of Univalves ; that is to fay, of the very 

 Shells, founded on the fix following parts ; 

 the fpires ; the top ; the opening, aperture 

 or mouth of the Shell ; the operculum or 

 cover ; the pearlinefs of the fubftance of 

 the Shell ; and its periofte or epidermis. 

 lie iikewife gives feven tables of affinities 

 taken from the parts of the animals ; as 

 the horns, eyes, mouth, &c. and from thefe 

 tables of affinities he forms his arrangement. 



The above tables are exceeding ingenl- 

 puS; but ufelefs : in that they are very 



perplexed, 



