New Contributions 

 to Paleontology 



The Osteology of Some American 

 Permian Vertebrates. By Samuel Wen- 

 dell Williston, Professor of Paleontology in 

 the University of Chicago. (Contributions 

 from Walker Museum, Vol. I, No. 8.) 



$6 pages, royal 8vo, paper; 25 cents, postpaid, 

 27 cents. 



These important new studies in paleontology in- 

 clude (i) Araeoscelis, (2) the skull of Casea, (3) 

 Arribasaarus, a New Genus of Theromorph Rep- 

 tiles from New Mexico, (4) The Primitive Structure of 

 the Mandible in Amphibians and Reptiles. 



Recent "Contributions from Walker Museum" in- 

 clude: 



Vol. I, No. 5. The Stokes Collection of Ant- 

 arctic Fossils. With plates. By 

 Stuart Weller. 6 pages, royal 8vo, 

 paper, 25 cents; postpaid, 27 cents. 

 No. 6. (i) The Osteology of the Skull of 

 the Pelycosaurian Genus, Dime- 

 trodon, (2) On the Structure of 

 the Fore Foot of Dimetrodon. 

 By E. C. Case. 12 pages, royal 8vo, 

 paper, 25 cents; postpaid, 27 cents. 



No. 7. Notes on Some Carboniferous 



Cochliodonts. With descriptions of 

 seven new species. With plates. By 

 E. B. Branson. 18 pages, royal 8vo, 

 paper, 25 cents; postpaid, 27 cents. 



The University of Chicago Press 



Chicago Illinois 



250 

 styles 



Ask 



your 



stationer 



I 



The 

 most 

 popular 

 pen in 

 the world — 

 Est erbrook's 

 Falcon No. 048. 

 The standard pen 

 for general correspond- 

 ence, combining a 

 smooth, medium point with 

 large ink-holding capacity. 



Write for illustrated booklet 



Esterbrook Pen Mfg. Co. 

 New York Camden, N. J. _ 



"sterbroo^ 



Pens I 



A Message from the Best Equipped Bookstore 



in the World 



We are the largest wholesale dealers in the books of all 

 publishers, English and American, and can conse- 

 quently render the most efficient service in filling your 

 orders for books. We solicit orders from 



BOOKSELLERS, PUBLIC LIBRA- 

 RIES, PUBLIC AND PRIVATE 

 INSTITUTIONS, ETC. 



We are well equipped to furnish customers with infor- 

 mation about out-of-print books, books on special sub- 

 jects, or books otherwise hard to obtain. All orders; 

 large or small, receive prompt attention. 



Catalogues sent on request 



THE BAKER & TAYLOR CO. 



Trade Agents in the East for 

 THE UNIVERSITY OF CHICAGO PRESS 



33-37 East 17th Street, Union Square North 

 NEW YORK CITY 



