Introduction. 



The present paper is the first part of the report on the Annelids brought home by the Ingolf 

 expedition. Together with these, however, some other material of Annelids from Northern seas has 

 been included. In this respect I shall name the rather considerable material brought home by several 

 Danish naturalists on different expeditions to Greenland, Iceland and the Faroe Islands. 



From East-Greenland originate the collections made by the Amdrup-Expedi tion, mainly 

 due to the late zoologist, Mag. scient. Soren Jensen; also the then captain in the navy, Ryder 

 and Caud. magist. Km use have brought home material from the East-coasts of Greenland. 



Of special interest is the material from Davis Strait brought home by Ad. Jensen, now 

 inspector at the zoological museum, on his cruises with the fishery investigation-ship "Tjalfe" 1908— 

 1909; these collections as well as the material brought home by Dr. Nor dm an 11 and Cand. magist. 

 Stephens en from their investigations in Greenland fjords have, together with the investigations of 

 the Ingolf-Expedition, brought to light a fauna rather different from the usual Greenland litoral fauna 

 with its well-known arctic forms --a fauna containing several boreal and more southern species not 

 hitherto known from Greenland waters. The named investigations have shown that concerning the 

 Annelids we have just the same facts in the distribution as have been established for other groups of 

 animals, viz. Molluscs, Crustacea and Echiuoderms: In Greenland waters we have to deal with so to 

 say two different faunas of different origin, namely an exclusively arctic fauna mainly restricted to 

 those tracts which have a negative bottom-temperature, and another mixed with species originating 

 from southern regions and confined to those parts of Greenland seas and fjords with a positive bottom- 

 temperature. 



From Iceland waters collections have been made by Dr. A. C. J oh an sen, Mag. scient. Otter- 

 strom, Mag. scient. A. Ditlevsen and Mag. scient. R. Honing. From the named seas are also 

 present Annelids collected by Ad. Jensen during a cruise with the Norwegian research-steamer 

 Michael Sars in 1902. 



A rather considerable material of Annelids was brought home from the Faroe Islands by 

 Dr. Th. Mortensen in the year 1899. Also Mag. scient. R. Honing, Mag. scient. A. Ditlevsen, 

 Cand. magist. Gemzoe and Mag. scient. Otterstrom have made collections at the coasts of the 

 Faroe Islands. 



Tlie Ingolf-Expedition. IV. 4. 



4187T 



