SMITHSONIAN CONTRIBUTIONS TO KNOWLEDG 



CONTRIBUTIONS 



TO THE 



NATURAL HISTORY OF THE FRESH WATER FISHES 



OF 



NORTH AMERICA. 



BY 



CHARLES GIRARD. 



I. 

 A MONOGRAPH OF THE COTTOIDS. 



ACCEPTED FOR PUBLICATION 



BY THE SMITHSONIAN INSTITUTION, 



DECEMBER, 1850. 



VOL. III. 



ART. 3. 



