vv ater Reptiles of the Past and Present 



By SAMUEL WENDELL WILLISTON 



Professor of Paleontology in the University of Chicago 



Professor Williston, who is widely known as a student of extinct reptiles and as 

 the author of American Permian Vertebrates, which has now become a standard 

 work, presents in this new volume a summary, divested as far as possible of 

 unnecessary scientific details, of our present knowledge concerning the reptiles of 

 the seas, lakes, and rivers of past and present times. While no attempt has been 

 made, save incidentally, to discuss the strictly terrestrial reptiles, twelve of the four- 

 teen orders of the class recognized by the author are treated more or less fully — 

 their structure, habits, geological distribution, etc. Unlike most of the books for 

 the general reader treating of "ancient monsters," the present work is by an author 

 who has spent many years in the field and laboratory in the collection and study 

 of extinct reptiles. 



The numerous illustrations, in large part from the pen or brush of the author 

 himself, include not only living types and twenty-four restorations of extinct forms, 

 but also many figures elucidating the structure and habits of the animals. 



viii-|-252 pages, royal 8vo, cloth; $3.00, postpaid $3.20 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO ILLINOIS 



