UNITED STATES 



EXPLORING EXPEDITION. 



DURING THE YEARS 



1838, 1839, 1840, 1841, 1842, 



UNDER THE COMMAND OF 



CHARLES WILKES, U. S. N. 



ATLAS. 



MAMMALOGY AND ORNITHOLOGY. 



BY 



JOHN CASSIN, 



MEMBER OF THE ACADEMY OF NATURAL SCIENCES OF PHILADELPHIA ; OF THE AMERICAN PHILOSOPHICAL SOCIETY • 

 OF THE NATIONAL INSTITUTE ; OF THE NATURAL HISTORY SOCIETY OF CHARLESTON • OF 

 THE LYCEUM OF NATURAL HISTORY OF NEW YORK ; OF THE NATURAL HISTORY SOCIETY OF MONTREAL : 

 CORRESPONDING MEMBER OF THE ZOOLOGICAL SOCIETY OF LONDON; HONORARY 

 MEMBER OF THE UNITED SOCIETY OF GERMAN ORNITHOLOGISTS, ETC. 



PHILADELPHIA: 



J. B. LIPPINCOTT & CO. 



1 8 5 8. 



