IVlr. 0. NoEDGAAED, Directoi" of the Biological Station in 

 Bergen, has kindly sent me a number of Holothurians, which he 

 has collected in the most northern parts of Xorway during the years 

 1894, 1897, 1899 and 1900. In connection with the treatise on 

 this collection, I will also mention some interesting discoveries in 

 the same district, chiefly made by Professor G. 0. Såes of Christiania. 

 At the same time I intend to give a complete list of all the different 

 species of Holothurians, which, as far as I know, have hitherto been 

 collected in Norway, north of the Arctic circle. 



Such a list might perhaps seem unnecessary, as Ludwig quite 

 recently (1900) in „Fauna Arctica" has written a treatise on the 

 Arctic and Subarctic Holothurians. This treatise is undeniably of 

 great value to those who study these animals, principally on account 

 of the copious references made in it to other literary publications 

 on the subject. Nevertheless, with respect as well to species as 

 to literature, it is not so complete as its author promises (1900, 

 p. 135). Besides this, it is by no means free from errors. Ludwig 

 has corrected some old ones, but he has made new mistakes, partly 

 through confusion in geographical names. And the incorrect state- 

 ments made by other authors about the Arctic and Scandinavian 

 Holothurians, he has naturally not been able to correct, as he had 

 not examined their material. Finally Ludwig's views, regarding the 

 geographical limits of the Arctic fauna are not, according to my opinion, 

 borne out by actual facts. The result of my own studies with fuller 

 Tiews on these matters, I hope later on to pubhsh in a monography 

 on the Arctic and Scandinavian Holothurians. Here I will only 

 mention such matters, as can serve to throw light on the fauna of 

 northern Norway. 



The district examined by Noedgaaed extends from 67° N. up 

 lo the North Cape ; thus it comprises the northern part of No]'dland 



