450 KNUT DAHL. 



In the first of these works the author describes the young 

 salmon during transition from the „stirr" stage to the „forell,, 

 stage. 



Also he describes their appearance during the „forell" stage. 

 He also admits the difficulty in distinguishing salmon and trout 

 in these stages. He is of the opinion that the young salmon at 

 about 20 cm. length pass into the „forell" stage and he expli- 

 citly states that the young of the salmon only after reaching 

 40 cm. in length acquires the typical characters of the species. 



He notes that young salmon in transition between „stirr" 

 and „forell" often are to be found as well in the Motala by 

 Norrköping as in the rivers of Norrland, (äfwen i Norrlands 

 elfvor), and that their length is 20 — 22 era. 



As far as can be seen however his descriptions are founded 

 only on specimens from Motala. He thus mentions only 3 

 specimens from Motala stream by Norrköping 21,5 — 23,2 — 26,7 

 cm, long, even the very locality, the dangers of which for the 

 present purpose i have mentioned above. 



In support of his description of the young salmon in this 

 stage he refers to one of the plates, accompanying the paper 

 representing a fish, which in the explanation of the plates ex- 

 pressly is stated to be a female of „Venerns blanklaks" ^ (the 

 relict Vener or londlocked salmon). 



Whether this specimen is identical with one of the 3 spe- 

 cimens measured and mentioned above, is not stated. 



This drawing is, as any one may satisfy himself higly dif- 

 fering from the representations of salmon in the same stage 

 given by me, (Vide pi. II and III.) 



In this latter paper he also gives a drawing representing a 

 salmon in the „forell" stage, even from Motala. (Vide Wgr. 

 „Nya bidrag etc." pl. XIV fig. 1.) This fish which I have had 

 the opportunity of personally examining, and which exists in the 



1 Vide pi. in Widegrens work tab. V fig. 2 („Bidrag till kännedomen etc."). 



