KUNGL SVENSKA VETENSKAPSAKADEMIENS HANDLINGAR. Band 60. N:o 9. 



NORTHERN AND ARCTIC HYDROIDA FROM 

 THE SWEDISH ZOOLOGICAL STATE MUSEUM 



BY 



ELOF JÄDERHOLM 



COMMUNICATED NOVEMBER 12™ gy HJ. THÉEL AND E. LÖNNBERG 



STOCKHOLM 



ALMQVIST & WLKSELLS BOKTRYCKERI-A. -B. 



BERLIN LONDON PARIS 



R. FRIEDLÄNDER & SOHN "WILLIAM "WESLEY & SON LIBRALRIE C. KLINCKSIECE: 



11 CARLSTRASSE 28 ESSEX STREET. STRAND 11 RUE DE LILLE 



