SMITHSONIAN MISCELLANEOUS COLLECTIONS. 



241 



ARRANGEMENT 



FAMILIES OF FISHES, 



OR 



CLASSES PISCES, MARSIPOBBANCHn, AM) 

 LEPTOCABDIL 



PREPARED FOR THE SMITHSONIAN INSTITUTION 



BY 



THEODORE GILL, M.D., Ph.D. 



WASHINGTON: 



PUBLISHED BY THE SMITHSONIAN INSTITUTION. 



NOVEMBER, 1S72. 



