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. HUTCHINSON. 



LONDON, March, 1910. 



