FORTAL. 



PREFACE. 



Nærværende Værk, til hvis Udgivelse Staten 

 liar bevilget de fornødne Midler, blev ])aal)egyndt 

 for mere end et Decennitim siden; men forskjellige 

 nforudseede Omstændigheder bar bevirket, at Ud- 

 arbeidelsen af samme i længere Tid li ar maattet 

 standses, saa at forst nu Værket kan udkomme i 

 sin Helhed. Oprindelig var Bevillingen givet til 

 den fortsatte Udgivelse af Fauna Utforalis Norvegice, 

 hvoraf tidligere er udkommet 3 Bind, forfattede 

 dels af min Fader alene, dels af ham i Forening 

 med nu afdode Overlæge Danielssen og Konservator 

 Koren. Da det forekom mig, at denne Titel paa en 

 mindre heldig Maade vilde komme til at begrændse 

 StoflFet, tillod jeg mig at foreslaa, at Benævnelsen 

 littoraJifi udgik og at Værket herefter skulde ud- 

 komme under don her anvendte Titel. Det af mig 

 til nærværende Bind valgte Stof er ogsaa af den 

 Art, at det vanskeligt vilde passe indonfor iiamme)i 

 af den tidligere Titel, da jo her ikke blot Sodyi-, 

 men ogsaa en Del ægte Fer.skvandsdyr er omhand- 

 lede. Idethele syntes mig, at den mere omfattende 

 Titel, Fauna Nonegiæ, bedre maatte kunne svare 

 til sin Hensigt, da der herunder vil kunne leveres 

 Bidrag til Belysning af hvilkensomhel.'it Branche af 

 Vor Fauna, der maatte frembyde en særlig Interesse. 

 I Overensstemmelse med de 3 udkomne Bind af 

 Fauna littoral is, tror jeg at nærværende Værk Ijor 

 indeholde Afhandlinger af en mere udforlig ana- 

 tomisk-biologisk Character, behandlende visse ud- 

 valgte Dele af vor Fauna og udstyTede paa en saa- 

 vidt m-aligt tidsmæs.sig Maade, saavel hvad Text 

 som Planeher angaar. I et andet, paa engelsk skre- 

 vet Værk liar j.'g paabegyndt en Bearbeidelse af 

 vor Fauna efier et herfra temmelig forskjelligt Brin- 

 eip, idet dette Værk er nærmest beregnet paa at 



The present work, for the publication of which 

 the Government has granted the necessary funds, 

 was begun more than ten 3'ears ago; but various 

 unforeseen circumstances having combined to put a 

 stop to the preparation of the work for a considerable 

 time, it is only now that it can be published in its 

 entirely. The grant was originally given for the 

 continiied publication of Fauna Uttoralis Norvegice, 

 of which three volumes had already been published, 

 written partly by my father alone, partly by 

 him in conjunction with the late Dr. Danielssen, 

 and Curator Koren. As it seemed to me that this 

 title would limit the subject-matter somewhat 

 infelicitously, I ventured to suggest that the desig- 

 nation Jiftoralis should be struck out, and that the 

 work should hereafter ajipear under the title here 

 employed. The matter chosen b\' me for the pre- 

 sent volume, is also of such a kind, tliat it could 

 hardly be included under the former title, as iiot 

 only marine animals, but also .some true fre.sh-water 

 animals are here treated of. Upon the whole, it 

 seemed to me that the more compi-ehen.sive title. 

 Fauna Norvegiæ, would better answer its purpose, as 

 under it, contriliutions might be made to the infor- 

 nuition concerning any branch of our fauna that 

 might oifer special interest. In accordance with the 

 3 published volumes of Fauna Uttoralis, 1 think that 

 the present work should contain treatises of a more 

 exhaustive anatomical-biological character, dealing 

 with certain parts of our fauna, and got up as 

 far as ])ossible in a manner suitable to the times, 

 as regards text and plates. In another wiu-k, 

 written in English, I have begun an account of our 

 fauna on a very diflerent principle to this, as it is 

 rather calculated to give, as far as possible, a brief. 



