Siboga-Expeditie 



XXIV' b 



POLYCHAETA ERRANTIA OF THE 

 SIBOGA EXPEDITION 



BY 



D^^. R. HORST 



Leyden 



PART II 



APHRODITIDAE and CHRYSOPETALIDAE 



With 19 plates and 5 textfigures 



LATE E. J. BRILL 



PUBLISHERS AND PRINTERS 



LEYDEN — I917 



