PREFACE. XI 



of Bristol, Mr. Saull, Mr. Wetherell of Highgate, and Mr. 

 Wigham of Norwich. 



I gratefully acknowledge the kind and valuable infor- 

 mation which Mr. Lyell has imparted to me respecting 

 the geological position and relations of the matrix of 

 many of the fossils described in this work ; and I owe 

 much to my accomplished friend Mr. Broderip for his 

 careful revision of the pages before they went to press. I 

 have cited only his important Memoir on the Stonesfield 

 Marsupials in the body of the work (p. 61), but I should 

 be wanting in acknowledgment of the valuable informa- 

 tion which, in common with a large proportion of the 

 reading public, I have derived from Mr. Broderip's 

 writings, were I not to state that I have especially profited, 

 in regard to many of the subjects treated of in the follow- 

 ing pages, by the rich and judiciously selected mass of in- 

 formation on extinct animals, which he has appended to 

 his most valuable Zoological contributions to the ' Penny 

 Cyclopaedia.' 



In the Wood Engravings of the fossils selected for illus- 

 tration, the skilful artist Mr. W. Bagg, of 63 Gower Street, 

 has ably cooperated in fulfilling the objects of this work, 

 by his intelligence in seizing, and care in expressing, their 

 most characteristic features. 



