CONTENTS. 
Introduction 
Some Remarks on he Scandinavian Titsratitee of he GENI rå, ÄMNE on et published 
during the Decades 1870—580 and 1880—90 
Critique of the Genera of the Sipunculids, hitherto known to inhabit he Nocthern and 
Aretie Seas . NE : 
Some Anatomical and SYStdsa tie RÖRS 
Tentacles , sne 
Retractor Muscles ka dre SAS 
The Muscular Layer of the Body-Wall . 
The Segmental Organs . 
The Reproductive Organs : 
Does Sexual Dimorphism exist among 0 Sipunculidst 
Parasites . 
Survey of the Swedish" Scientific Papeditions a vikas es! which have brought home 
Collections of Invertebrates from the Aretie and Scamdinavian Seas . 
Aecount of the Species 
List of Genera and Species and diet Sidon 2 
Explanation of the Plates. 
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NÖRENSEE NORENS 
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