KUNGL. SVENSKA VETENSKAPSAKADEMIENS HANDLINGAR. Band 50. N:o 5. 



NORTHERN 



AND 



ARGTIC INVERTEBRATES 



IN THE 



GOLLECTION 



OF THE 



SWEDISH STATE MUSEUM 



(RIKSMUSEUM) 



VI. 



PROSOBRANCHIA. 2 SEMIPROBOSGIDTFERA 



BY 



ISTILS HJ. ODHlvrEIl 



WITH FIVE FLATES AND FIVE FIGURES IN THE TEXT 



COMMUNICATKD NOVKMBKR 27™ 1912 BY H.I. THKKL AND C. HOLM 



UPPSALA & STOCKHOLM. ALMQVIST & WIKSELLS BOKTRYCKERI-A.-B. 



BERLIN 



R, FRIEDLÄNDER & SOHN 

 11 CARLSTRASSE 



LOXDOX 



WILLIAM WESSLEY & SON 

 28 ESSEX STREET. STRAND 



PARIS 



LIBRAIRIE C. KLINCKSIECK 

 11 EUE DE LILLE 



