/iDemotrs of tbe /IDuseum of Comparattve Zoolog? 



AT HARVARD COLLEGE. 

 Vol. XLVIII. 



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

 TRAL AND SOUTH AMERICA, AND OFF THE GAL.iPAGOS ISL.ANDS, IN 

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

 STEA]\IER "ALBATROSS," DURING 1891, LIEUT.-COMISIANDER Z. L. 

 TANNER, U. S. N., COMMANDING. 



XXXVIII. 



REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 

 TROPICAL PACIFIC, IN CHARGE OF ALEX.\NDER 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 COMIMISSION STEAMER "ALBATROSS," FROM OCTOBER, 1904, 

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

 MANDING. 



XXXL 



THE ANNELIDA POLYCHAETA. 



By RALPH V. CHAMBERLIN. 



WITH EIGHTY PLATES. 



TEXT. 



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



CAMBRIDGE, U. S. A.: 



prtnteC) for tbe /Cuseum. 



JCLY, 1919. 



