PREFACE. 



In presenting to the scientific world the 1st Volume of the great 

 work on Norwegian Crustacea, which I have entered upon, I wish to make 

 the following observations about the plan of the work in general, and csp.Ti- 

 ally that of the present Volume. 



The author, who during a long series of }^ears has been engaged bv 

 the government to make investigations about the sea-fisheries of Norway, and 

 for this purpose has made numerous journeys of research along the whole 

 Norwegian coast, from the Christianiafjord to Vadse, has therein- had an 

 unusually convenient opportunity for at the same time studying the rich 

 marine invertebrate fauna occurring along that extensive coast, and ha- 

 especially made himself familiar with the several groups of Crustacea, which 

 had long before been his special study. A very large amount of zoological 

 material has thus from time to time been brought together from many different 

 localities, and among this material have been found numerous interesting form< 

 new to science. Most of the new Crustacea have been briefly characterised 

 by the author in several papers, chiefly published in the Transactions of til-- 

 Scientific Society of Christiania, and a few groups, for instance the J///>/rA, . 

 have also been more fully treated of in separate treatises. It has. however, 

 appeared to the author very desirable, that a full account of the rich card 

 nological fauna of Norway should be given, like that of the British Crustacea 

 long ago published by several distinguished carcilogists both because 

 faunistic works have on the whole shown themselves to be extremely useful, 

 and because the fauna of Norway, as is well known, belongs to l\vo distinct 

 zoological regions, the boreal and arctic, and thus exhibits characteristic differ- 

 ences from that of the British Isles. Indeed, the author has Ion- felt if as 

 a veritable duty, by entering upon a such work, to utilise his Ion- experienc 

 for the benefit of future carcinologists. But the great expenses connecte 

 the publication of such an extensive work in the usual manner, as |.ul>li<-aii 

 from the University, have hitherto prevented him from reali/ing his plan, and 

 it is only some few years since the idea struck him to get the uork pub 



