, 111 



iliink they have improved upon tlie Linnacan ])lan, or 

 in the leafl clucidaied the fubjeft: it muft, however, be 

 confeficd, that fonie of the generic charafters of that 

 great naturalift, are not fufficient diftinftions, though 

 we admit, it would perhaps be difficult to alter them for 

 the better : and as to the animals, that inhabit the fame 

 genus of fliells, being all the fame, as has been generally 

 fuppofed, we may venture to affirm, that fimilar fliells 

 are fometimes inhabited by very different animals ; and 

 that fev/ of tlie Linnsan genera of teilacea, are wholly 

 inhabited by the fame kind of animal. On this fubjeft, 

 however, much remains to be done, being as yet in 

 couliderable obfcurity. 



Some new genera might probably be formed with 

 advantage, as a vafl: variety of fliells have been difcover- 

 ed flnce the lafl; edition of the Syftema Naturae, which 

 were wholly unknown to Linnaeus ; and amongfl them 

 many produftions of our own coaflis, which do not 

 fl;ri6lly belong to any of the Linnaean genera. Wc have, 

 however, pretty fliriftly adhered to that arrangement, 

 except in a few infl:ances. 



The genus Lepas, we have divided into two : after 

 the plan of Doftor Pulteney, as not pofleffing any 

 fimilitude, except in that of the animal inhabitants. 



Thofe 



