vi TEXT -BOOK OF PALAEONTOLOGY 



Grateful acknowledgments are due to Professor H. F. Osborn and Dr. 

 0. P. Hay, of the American Museum of Natural History in New York, and to 

 Mr. J. B. Hatcher, of the Carnegie Museum at Pittsburgh, for valuable notes 

 and suggestions on the group of Reptiles, especially the order Dinosauria ; and 

 to Professor S. W. Williston, of the State University of Kansas, for his revision 

 of the Reptilian Orders Squamata and Fferosauria, with notes on the Plesiosauria 

 and Chelonia. To Mr. Frederic A. Lucas, of the United States National 

 Museum at Washington, was confided the task of arranging the text for the 

 class Aves in its present shape, which involved the rewriting of the entire 

 systematic and most of the general or introductory part. The balance of the 

 present volume, in so far as it departs from the original text, owes its condition 

 conjointly to the work of the Author and Editor. 



In spite of the imperfections inevitable to a treatise produced in this 

 manner, the hope is expressed that the subject-matter will be found more 

 nearly up to date, and on the whole better adapted to the needs of English- 

 speaking students than would have been the case had the Editor contented 

 himself with bringing out a strictly literal translation. He would likewise 

 speak a word of gi-atitude for the many favours and indulgences he has 

 received at the hands of his friend and master, the Author. 



CHARLES R. EASTMAN. 



Harvard University, 



Juhi 1902. 



