PREFACE 



TO PART II. 



The publication of the First Volume of this 

 Work has elicited so many testimonies to its 

 usefulness, as to satisfy me that I had not erred in 

 supposing that such a book was needed. I now 

 introduce the Second (and final) Volume^ hoping 

 that it may be received with as much favour as its 

 predecessor. 



By a most singular coincidence, the number of 

 figures in this volume is exactly the same as in 

 the former, viz. three hundred and thirty-nine; 

 and as each genus is illustrated, we see that so far 

 as our present knowledge goes, those genera of our 

 Marine Fauna, which belong to the Radiate and 

 Annulose forms, exactly equal in number those of 

 the Mollusca and Vertebrata. 



