KUNGL. SVENSKA VETENSKAPSAKADEMIENS HANDLINGAR. Band 41. N:o 4. 



NORTHERN 



AND 



ARCTIC INVERTEBRATES 



I\ THK 



COLLECTION 



OF THI-: 



SWEDTSH STATE MUSEUM 



(RIKSMUSEUM) 

 III. 



OPISTHOBRANCHL\ AND PTEROPODA 



BY 



NILS ODHT^ER 



WITH THREE Pr.ATlvS 



COMMUNICATED MAY 9™ mori I5Y H.l. THKKL AND CHH. AURIVILLIUS 



UPPSALA & STOCKHOLM 



ALMQVIST & WIKSELLS BOKTRYCKERI-A.-B. 



1907 



