BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 26. AFD. IV. N:0 8. 11 



I did not see any specimens of this kind except in the 

 Yolga delta, but I was told that the »lin» also lived in Trans- 

 caucasia, for instance, in lake Adshi-Kabnl. 



Leuciscus idus (Lin.) 

 from tlie Vol sa delta. 



Total length 



Length of head 



Diameter of eye 



]'rEeorbital leugtli 



Postorbital 



Height of body 



Least heigtt of caudal peduncle 



Distance from snout to dorsal fin 

 » ;• 5 •' anal » 



» » :■ » ventral fins 



Prseabdominal length 



Postabdominal » 



Length of base of dorsal fin 



Height of the same 



Length of base of anal fin 



Height of the same 



Length of pectoral fins 

 » 2 ventral ^ 



Lateral line 



in % of tot. length 



These measurements do not show any differences between 

 the sontheastern and the northern form except that the base 

 of the dorsal fin of the former is a little shorter (10,3 % — 

 10,8 % of tot. 1.) than in the latter (11 — 12 %) and the pec- 

 torals are slightly longer in the southern form (17,6 — 18, o) 

 than in the northern (17,5 — 15). This is, however, so little 

 difference that it is hardly worth speaking of. 



I did not see any fish of this kind except in the Volga 

 delta and it seems stränge that this species which is doing 

 so well in the Baltic, and even in the Sound, should not 

 enter the Caspian Sea. But it is here at the southern limit 

 of its distribution, probably due to climatological conditions 

 as it is one of our earliest springfishes. 



