American Permian Vertebrates 



By SAMUEL W. WILLISTON 



HIS work comprises a series of monographic studies, with briefer 

 notes and descriptions of new or little-known amphibians and 

 reptiles from the Permian deposits of Texas and New Mexico. 

 The material upon which these studies are based was for the 

 most part collected during recent years by field parties froni the University 

 of Chicago. The book is offered as a contribution to knowledge on the 

 subject of ancient reptiles and amphibians, with such summaries and 

 definitions based chiefly on American forms as our present knowledge per- 

 mits. The work is illustrated by the author. 



m-\-i46 pages and j8 plates, 8vo, cloth; $2.^0, postage extra (weight 2 lbs. 4 oz.) 



THE UNIVERSITY OF CHICAGO PRESS 



CHICAGO - - - - - ILUNOIS 



