PREFACE TO NEW EDITION xxi 
most grateful. Dr. C. W. Andrews and Mr. W. P. Pycraft have 
also given much help of a similar nature. The kind advice of 
such learned gentlemen is greatly valued by their friend the 
Author, for they know practically all that goes on in the world 
of Palaeontology. 
H. N. HUTCHINSOK 
London, Marc\ 1910 . 
