nr^HE present paper on the Zoantharia (Zoanthidae) has been drawn np according to the same plan 

 ■*• as my report on the Ceriantharia of the Ingolf-Expedition. Thus, it comprises not only the 

 Zoantharia collected during the Ingolf-Expedition but also all the other northern and arctic forms of 

 this group of animals which have been sent to me for examination, especially from the Riksmuseum 

 in Stockholm but also from the museums in Copenhagen, Upsaia, Bergen, Trondhjem and Tromso. 

 Besides, I have had the opportunity of examining some forms from the museums in Vienna and 

 Berlin. To the chiefs of the Invertebrate departments or the custodians of the Coeleuterata at these 

 museums I would offer my best thanks for having lent me the material required. I am also greatly 

 indebted to my colleague Docent Nils Holmgren in Stockholm for helping me to photograph the 

 originals for the figures reproduced on PL 2. 

 The paper is divided into three parts: 



1. Literature and summary of the northern and arctic Zoantharia. 



2. Contribution to the systematic classification of Zoantharia (Zoanthidae). 



3. Description of the species. 



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