/iDemotrs of tbe /iDuseum ot Comparattpe Zoologg 



AT HARVARD COLLEGE. 

 Vol. XLVIII. 



REPORTS ON AN EXPLORATION OFF THE ^VEST COASTS OF MEXICO, CEN- 

 TRAL AND SOUTH AMERICA, AND OFF THE GALAPAGOS ISLANDS, IN 

 CHARGE OF ALEXANDER AGASSIZ, BY THE IT. S. FISH COMMISSION 

 STEAMER "ALBATROSS," DURING 1891, LIEUT. COMMANDER Z. L. 

 TANNER, U. S. N., COMMANDING. 



XXXVIII. 



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. MO.SER, U. S. N., COMMANDING. 



XX. 



REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE EAST- 

 ERN TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASSIZ, BY THE 

 U. S. FISH COMMISSION STEAMER "ALBATROSS," FROM OCTOBER, 1904, 

 TO MARCH, 1905, LIEUT.-COMMANDER L. M. GARRETT, U. S. N., COM- 

 MANDING. 



XXXI. 



THE ANNELIDA POLYCHAETA. 



By RALPH V. CHAMBERLIN. 



WITH EIGHTY PLATES. 



PLATES. 



[Published by permission of Hugh M. Smith, U. S. Commissioner of Fish and Fisheries]. 



CAMBRIDGE, U. S. A.: 



prtnteD for tbe /IDuseum. 



July, 1919. 



