SECTION VII. 141 



Thefe are the neceflary notices that oc- 

 cur to me relative to the recent Limpets, 

 or thofe known from fea. But, as appen- 

 dixes to the leveral families of recent Shells, 

 Ifhall enumerate fome foflii Shells which 

 are not yet, to my knowledge, difcover- 

 ed ov known recent or living, in order to 

 form a more complete fyftem of teftaceous 

 animals than has hitherto been done : by- 

 interpolating the unknown foffil Shells with 

 the recent ones. For not only fingle Ipe- 

 cies of foffil Shells yet remain undilcovered 

 in their recent or living ftate ; but genera, 

 and even whole families, as the Ammonia, 

 Anomiie, &c. by which means I add thofe 

 Defiderata which we are fure ftill exift 

 in the feas, though not yet known to us 

 otherwife than in the foffil ftate. 



Foffil Limpets are very rarely met with ; 

 however, there are two kinds which feem 

 to challenge a place in this appendix, 

 iriz. 



A fniall 



