SMITHSONIAN CONTKIBUTIONS TO KNOWLEDGE. 



— 192 



CRETACEOUS REPTILES 



UNITED STATES. 



BY 



JOSEPH LEIDY, M.D., 



PEOPESSOR OP ANATOMY IN THE UNIVERSITY OP PENNSYLVANIA, CURATOR OP THE ACADEMY OP 

 NATURAL SCIENCES OF PHILADELPHIA. 



[ACCEPTED POR PUBLICATION DECEMBER, 1864.] 



