PREFACE. Vll 



together under tlie Linnaean genera, by Linnaeus or his suc- 

 cessors. A few figures are added, to show the different form of 

 the mouth of some shells which are placed together in the 

 same genus ; as Helix Gualteriana (the mouth of which is 

 much like that of Trochus Solaris) ; and Helix sinuata, which 

 has teeth ; also Turbo bidens, Jutiiperi, &c. 



SAMUEL BROOKES. 



Penliein, 

 May 10, 1816. 



