TO 



THE ROYAL SOCIETY OF LONDON, 



This Work, which owes its origin to the Society's favourable reception of the 

 Authors commwiications on the Megatherium, and allied fossils, in the years 

 1851 and 1855, and the drawings for its illustration chiefly to the liberal 

 application thereto of part of the 'Government Grant,' is, by permission of the 

 President and Council, most gratefully and respectfully dedicated, by 



THE AUTHOR. 



