Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 



Vol. LIl. No. 13. 



REPORTS OX THE SCIEXTLFIC RESULTS OF THE EXPEDITION TO THE 

 EASTERN TROPICAL PACIFIC, IX CHARGE OF ALEXANDER AGASSIZ, 

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

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

 U. S. N., COMMANDING. 



XX. 



MUTATIONS IN CERATIUM. 



Bv Charles Atwood Kofoid. 



With Four Plates. 



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



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

 PRINTED FOR THE MUSEUM. 



September, 1909. 



