lemorrs of tijt Htuscum of fi^amparalibt iodlogg 



AT HARVARD COLLEGE. 



Vol. XXX^. No. 1. 7X- 



REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 

 TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASSIZ, BY THE 

 U. S. FISH COMMISSION STEAMER "ALBATROSS," FROM AUGUST, 

 1899, TO MARCH, 1900, COMMANDER JEFFERSON F. MOSER, U. S. N., 

 COMMANDING. 



XI. 



ECHINI. 



THE GENUS COLOBOCENTROTUS. 



By ALEXANDER AGASSIZ. 



"WITH FORTY-NINE PLATES. 



[Published by Permission of Georqb M. Boweks, D. S. Commissioner of Fisli and Fisheries.] 



CAMBRIDGE, U.S.A.: 



^rintctr for tfje lEuseum. 



NoVEJVUiEK, 1908. 



