PREFACE. Xi 
of Bristol, Mr. Saull, Mr. Wetherell of Micheate 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 [ owe 
much to my accomplished friend Mr. Broderip for his 
careful revision of the pages before they went to press. | 
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 imforma- 
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 
Cyclopedia.’ 
In the Wood Engravings of the fossils selected for illus- 
tration, the skilful artist Mr. W. Bagg, of 63 Gower Street, 
has ably codperated in fulfilling the objects of this work, 
by his intelligence in seizing, and care in expressing, their 
most characteristic features. 
