KUNGL. SVENSKA VETENSKAPSAKADEMIENS HANDLINGAR. Band 48, 
NORTHERN 
AND 
Nord: 
RR CIIC INVERTEBRATES 
IN THE 
COTTA ECT LON 
OF THE 
SWEDISH STATE MUSEUM 
(RIKSMUSEUM) 
Ne 
PROSOBRANCHIA. 1 DIOTOCARDIA 
BY 
NIE S ODEN TER 
WITH SEVEN PLATES 
COMMUNICATED DECEMBER 6TH 1911 BY HJ. THÉEL AND G. HOLM 
UPPSALA & STOCKHOLM 
ALMQVIST & WIKSELLS BOKTRYCKERI-A.-B. 
1912 
