/iDcmoirs of tbe /iDuseum ot Comparative Zooloop 



AT HARVARD COLLEGE. 

 Vol. XLVIII. 



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

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

 CHARGE OF ALEXANDER AGASSIZ, BY THE U. S. FISH COMIVIISSION 

 STEAIVIER "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. MOSER, 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. 



TEXT. 



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



CAMBRIDGE, U. S. A.: 



printed tor tbc /IDuscum. 



July, 1919. 



