XX INTRODUCTION. 



beg to repeat my thanks to the persons therein named, as without 

 their support the following work would not have appeared. There 

 is, however, one absent name, that of my esteemed and regretted 

 friend Dr. W. E. Leach, of whom it has been said, " nihii non teti- 

 git, et omnia qua tetigit ornavit,^' — as well as that of his commender, 

 my friend the Rev. W. Kirby, from whom I have received such 

 signal marks of assistance, that it would be unpardonable were I 

 to pass them over tacitly. 



\* Every Species is referred to, which are. mcntinncd in the Works 

 quoted herein^ to which a * is attached in the subjoined 1 i%t. 



