KNUT DAHL. 



wich in many localities in this country is applied to the sea 

 trout. This circumstance also throws some doubt on the case. 



In the works of Fries, Ekström and Sundewall, Liljeborg, 

 Krøyer and other Scandinavian faunists as well as in those of 

 british authors such as Couch and Yarrel. one will in vain 

 search for specifications regarding the material, on wich their 

 descriptions are based. 



As mentioned before, their works are mainly faunas with 

 diagnostic descriptions and biological notes chiefly founded on 

 the works of other investigators or on revision of the collections, 

 wich in the course of time, throgh the efforts of these investi- 

 gators, have been desposited in the museums. Only in one 

 work I have found reliable accounts of salmon of a httle 

 larger size than in the young salmon emigrating from our rivers. 

 Vide „Neuere Lachs und Maifisch-Studien" by P. P. G. 

 Hoek. 1899. 



The author has examined the young salmon wich during 

 the month of may emigrate from the Rhine and graphically 

 described their size. From his graphical table it will be seen 

 that these young on the average are a little larger than the 

 smolts of norwegian rivers. The more southerly location of the 

 Rhine probably accounts for a more rapid growth. The am- 

 piltude of his curve mainly reaches from 10 to 18 cm. with 

 a couple of exceptions of a little larger size, while my curves 

 (cfr. tab. IV col. 1, 2, 3) average a little lower with one excep- 

 tion of 16 cm. 



His drawing PL I fig. 4 in all essential respects resembles 

 the largest smolts cought by me and has still got the parrmarks 

 and the red spots along the lateral line. 



According to my oppinion the abovementioned facts are 

 sufficient to show, that earlier descriptions of young salmon 

 between the emigration stage and the grilse stage are not foun- 

 ded upon sufficient material. In examining the large material, 

 collected through about half a century or more, wich the swe- 



