JUSJ 



Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 



Vol. LII. No. 13. 



REPORTS OX THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 

 EASTERN TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASS1Z, 

 BY THE U. S. FISH COMMISSION STEAMER "ALBATROSS," FROM 

 OCTOBER, 1904, TO MARCH, 1905, LIEUT. COMMANDER L. M. GARRETT, 

 U. S. N., COMMANDING. 



XX. 



MUTATIONS IN CERATIUM. 



By Charles Atwood Kofoid. 



With Four Plates. 



[Published by Permission of George M. Bowers, U. S. Fish Commissioner.] 



CAMBRIDGE, MASS., U.S.A.: 



PRINTED FOR THE MUSEUM. 



September, 1909. 



