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 grouj) of Reptiles, especially the order Dinosaicria ; and 

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

 of the Reptilian orders Squamata and Fterosauria, Avith notes on the Flesiosauria 

 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 reAvriting 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, OAves its condition 

 conjointly to the Avork 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 Avill be found more 

 nearly up to date, and on the AA^hole better adapted to the needs of English- 

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

 himself Avith bringing out a strictly literal translation. He Avould likewise 

 speak a Avord of gratitude for the many faA'ours and indulgences he has 

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



CHARLES R. EASTMAN. 



Hara'ard University, 

 Juhi 1902. 



