COISTTEISTTS OIF ^OL. XV. 



PAGE 



Extract from the Laws of the Society relating to the Transactions, . . . ii 



Officers of the Society for the year 1880, iv 



List of the members of the Society elected since the publication of the Fourteenth volume, . . . . v 

 List of the members of the Society deceased since the publication of the Fourteenth volume, . . . . ix 



IP ^ -R, T I . 

 ARTICLE L 



Topography of the Punjab Oil Region. By Benjamin Smith Lyman. (With a map), 1 



ARTICLE II. 



Notes on the Geology of West Virginia. By John J. Stevenson, . » .. . 15 



ARTICLE III. 



The Staley's Creek and Nick's Creek Iron Ore Region. Bj^ Benjamin Smith Lyman. (With a map), ... 33 



ARTICLE IV. 



On the Topography and Geology of Santo Domingo. By William M. Gabb. (With a map), . . . .49 



IP ^ "R, T IT. 

 ARTICLE V. 



Supplement to the Extinct Batrachia and Reptilia of North America. By Edward D. Cope, A.M., . . . 2C1 



ARTICLE VL - 

 An Analysis of the Life-Form in Art. By Harrison Allen, M.D. (With 185 wood cuts), 279 



F T X X X . 



ARTICLE VII. 



On the Contents of a Rock Retreat in Southeastern Pennsylvania. By S. S. Haldeman. (With 15 plates). 



351 



