PREFACE. 



In presenting to tlie scientific world the 1st Volnme of the great 

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

 the following observations about the plan of the work in general, and especi- 

 ally that of the present Volume. 



The author, who during a long series of years has been engaged by 

 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 Vadso, has thereby had an 

 nnusually convenient opportunity for at the same time studying the ricli 

 marine invertebrate fauna occurring along that extensive coast, and has 

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

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

 material has thus fi'om time to time been brought together from many different 

 localities, and among this material have been found numerous interesting forms 

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

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

 Scientific Society of Christiania, and a few groups, for instance the Wli/tiidfr. 

 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 carci- 

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

 long ago published by several distinguished carcilogists, botli because sucli 

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

 and because the fauna of Norway, as is well known, belongs to two distinct 

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

 ences from that of tlie British Isles, Indeed, the author has long felt it as 

 a veritable duty, by entering upon a such woi'k, to utilise his long experience 

 for the benefit of future carcinologists. Birt the great expenses connected with 

 the publication of such an extensive work in the usual manner, as publication 

 from the University, have hitherto prevented him from realizing liis plan, and 

 it is only some few years since the idea struck him to get tiie work published 



