J 



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



NORTHERN 



AND 



ARCTIC INVERTEBRATES 



IN THE 



GOLLEGTION 



OF THE 



SAA EDISH STATE MUSEUM 



(RIKSMUSEUM) 



VI. 



PROSOBRANCHIA. 2 SEMIPROBOSGIDIFERA 



BY 



NILS HJ. ODHNER 



WITH 1 IVE PLATES AND FIVE FIGURES IN THE TEXT 



COMMUNICATKl) NOVKMBliR 27Th 1912 HY H.I. THEEL AND G. HOLM 



UPPSALA & STOCKHOLM 



ALMQVIST & WIKSELLS HOKTUYCKERI-A.-B. 



1U13 



