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^ / i X /^^ " Entered at the Philadelphia Post-Office as second-class matter. 



PROCEEDINGS 



OF THE 



AMERICAN PHILOSOPHICAL SOCIETY, 



HELD AT PniLADELPHIA, FOR PROMOTING USEFUL KNOWLEDGE. 



VOL. XXII. JANUARY, 1885. PART I. No. 117. 



TABLE OF CONTENTS. 



PAGE. 



The Extinct Mammalia of the Valley of Mexico. By E. D. Cope 1 



On the Structure of the Feet in the Extinct Artiodactyla of North 

 America. By E. D. Cope '-21 



Fifth Contribution to the Knowledge of the Fauna of the Permian for- 

 mation of Texas and the Indian Territory. By S. D. Cope (with 

 plate) 28 



Biographical Notice of Gen. A. A. Humphreys, U. S. A. By Hamp- 

 ton L. Carson 4S 



Biographical Notice of Henry M. Phillips. By Richard Vaux 72 



Biographical Sketch of Professor Samuel D. Gross. By/, M. JDa Costa, 



M.D 7S 



Stated Meeting, December 19, 188 J/, 85 



Remarks of Mr. Ashburuer on the recent publications of the Second 

 Geological Survey of Pennsylvania 80 



Published for the American Philosophical Society, 



BY 



McCALLA & STAVELY, 



NOS. 237-9 DOCK STREET, PHILADELPHIA. 



