ir INTRODUCTION. 



The afTigning adequate trivial names to the fhells, except in a few inftances, 

 hath been omitted, through the fear of giving fuch as might any way inter- 

 fere with thofe aheady given by Linnocus, to Shells of the fame kinds, the 

 principal aim has been to give concifc and accurate defcriptions of them ; 

 how they may be approved, is fubmitted to the public. 



As it is an allowed difficulty to determine v/here one clafs of Shells ends, 

 and another begins, a liberty is taken of placing all the comprefled Snails 

 under the title HELIX, and thole with a produced clavicle, whether lefs 

 or more, and whether the aperture be round or oval, or tending to either 

 form, under the title TURBO, wliich it is hoped will be pardoned by the 

 Critics in Conchology. 



I-t having been fuggeded that many of thefe Shells may prove to be the fry of 

 fhells heretofore publiflied, great care hath been taken to obviate that idea, 

 feveral fpecimcns fufpefted to be fuch, have therefore been laid afide for 

 future inveftigation. 



The Author begs leave to inform his readers, that he wiil continue his 

 refearches ; and if he fiiould be fo fuccefcful as to procure a fufHcient num- 

 ber of Shells for another plate, it (hall be publilhed feparately, as an appendix, 

 to accommodate the prefent purchafers, without putting them again to the 

 cxpence of the whole : And that he (hall think himfelf much obliged to any 

 Gentleman who will favour him with any minute Shells here unnoticed, with 

 an account where difcovered, or any other obfervations tending to illuflraie 

 this part of our natural hiftory 



Faversham, GEO. WALKER. 



ERRATA. 



Page 4. Fig. 15. reaaimpeiforatotranfverfe ft. latum, 

 q. 31. read depiftus. 



The Dcfca? in the Punauation it Is hoped will be excufcd ; and tliC 

 Pate May i, 17S4, added at the End of the Introduaion. 



