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



NORTHERN 



AND 



ARCTIC . INVERTEBRATES 



I\' THE 



GOLLEGTION 



OF THE 



SWEDISH STATE MUSEUM 



(RIKSMUSEUM) 

 III. 



OPISTHOBRANGHIA AND PTEROPODA 



BY 



WITH THREE PLATES 

 COMMUNICATED MAY 9Th 1906 BY H.I. THÉEL AND CHR. AURIVILLIUS 



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



BERLIN LONDON PARIS 



R. FEIEDLÄNDEE & SOHN WFLLIAM WESLEY & SON LIBEAIKIE H. LE SOUDIEE 



11 CARLSTEASSE ,; 28 ESSEX STEEET. STEAND 174 BOULEVAED S:T GEKMAIN 



