BIHANG TILL K. SV. YET.-AKD. HANDL. BAND. 26. AFD. IV. N:0 8. 15 



than with the one of »pigus». I do so if perhaps there sliould 

 be proved to be any greater difference between these two 

 than such a one which can be explained by the geographical 

 separation of the varieties mentioned. 



Leuciscus frisii Nordman 

 from the Volga delta. 



Total length in mm 520 



Length of head in % of tot. Itngth 19,8 



Diameter of eye » » » » » 2,7 



Prseorbital length » » » » » 7,2 



Postorbital » i.»»» » 10,3 



Height of body » i » » » 17,5 



Least height of caudal peduncle j s » » » 7,5 



Distance between snout and dorsal fin » » » » s 46,7 



>■ v » » anal » »»»» » 67,8 



> » » » ventral fins » » » » » 43,8 



Prseabdominal length » » » > t, 23,8 



Postabdominal » >»»» s 24,0 



Length of base of dorsal fin » » » » » 11.3 



Height » »> »S5>» » 12,5 



Length of base of anal » »»»» » 10,7 



Height > » » s> » j » » 8,5 



Length of pectoral fins » » » » » 14,9 



■' > ventral » »»»» » 12,0 



Lateral line 55 (59) 



Transversal » — f — 1 



5 



The fish from which these measurements have been taken 

 was a verv beautiful specimen, thickly beset with large pearly 

 excrescences. It was caught at Saposhnikov's establishment 

 in the Volga delta the 28th of April. It is thus evident that 

 this species spawns in the lower Volga although it seems to 

 be scarce there. It was the only specimen I observed during 

 my stay at the place mentioned. I am accordingly not able 

 to say if the difference in the number of scales in the lateral 

 line exhibited by this form compared with the number stated 

 by Varpachovskij ^ (»61 ^£ 67») is an individual variation or 



^ Varpachovskij: Onpe^ijiKTejib np-fecHBO^inux-L puot, Petersburg 1898. 



