6-0 t ,7 3 



^cparfmcnf of fKc ^nicviav: 



U. S. NATIONAL MUSEUil. 



24 -^ 



/-m 



Sa-'r 



BULLETIN 



UNITED STATES NATIONAL MUSEUM. 



ISTo. 31. 



PUBLISHED UNDER THE DIRECTION OF THE SMITHSONIAN INSTITUTION. 



WASHIKGT01^^; 



GOVERNMENT PRINTING OFFICE. 



1881. 



