I. Introduction. 



One of the results of the Danmark Expedition has been a very 

 considerable and important extension of our knowledge with regard 

 to the marine, Jurassic and Cretaceous deposits of East Greenland 

 and thus of the Arctic zone as a whole. The Expedition brought 

 home a very complete material of these deposits, from regions whose 

 geological structure had hitherto been quite unknown or only very 

 imperfectly studied. This material was intrusted to me for investiga- 

 tion by the Committee for the Danmark Expedition, and as it proved 

 to have come from deposits which were almost all younger than the 

 Jurassic deposits investigated by the Danish expeditions of 1891 — 92 

 and 1909, in regions of East Greenland somewhat further south, and 

 as no material for comparison existed in Copenhagen, the Committee 

 voted me the necessary funds for a journey to Munich. Here Pro- 

 fessor Rothpletz with the greatest willingness permitted me to use 

 the rich collections of the Pakeontologieal Museum there for com- 

 parison, and 1 would express my best thanks to him here for this 

 permission. -- On the return journey from Munich I made a short 

 stay at Gottingen , where the well-known expert on the Jurassic 

 deposits of the Arctic regions, Professor Pompkckj, was so kind as to 

 look through a part of my material, especially the Ammonites. For 

 the suggestions and information Prof. Pompkckj gave me on this 

 occasion I am extremely indebted to him. As, further, a number of 

 species occurred in the material, which had earlier been described by 

 Tullberg and Lundgren from the Jurassic deposits of Nova Zembla 

 and Spitzbergen, I desired to compare my material with theirs and 

 journeyed to Stockholm on my return from Germany. For the friendly 

 permission given me there to make the comparison, it is a pleasant 

 duty to lender my best thanks to Professor G. Holm, the Director of 

 the Zoopalseontological Department of the Riksmuseum. 



xi.v. sa 



