SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 93 



?' 



THE SESSILE BARNACLES (CIRRIPEDIA) CONTAINED 



IN THE COLLECTIONS OF THE U. S. NATIONAL 



MUSEUM; INCLUDING A MONOGRAPH 



OF THE AMERICAN SPECIES 



BY 



HENRY A. PILSBRY 



Special Curator of the Department of Mollusca, Academy 

 of Natural Sciences of Philadelphia 





WASHINGTON 



GOVERNMENT PRINTING OFFICE 

 1916 



