SMITHSONIAN MISCELLANEOUS COLLECTIONS. 



247 



ARRANGEMENT 



OF THE 



FAMILIES OF FISHES, 



CLASSES PISCES, MARSIPOBRANCHII, AND 

 LEPTOCABDII. 



PKEPAKED FOB THE SMITHSONIAN INSTITUTION 



BY 



THEODOKE GILL, M.D., Ph.D. 



WASHINGTON: 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION. 



NOVEMBER, 1S72. 



