BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 26. AFI). IT. N:0 8. 19 



Leucabramis vimba (Lin.) suhsp. persa (Gmelin) Kessler. 



Total length 



% of total length: 



Length of head 



Prseorbital length 



Diameter of eye 



Base of dorsal fin 



Distance between snout and anal fin 



Base of anal fin 



Praeabdominal length 



Postabdominal > 



Distance between snout and dorsal fin . 

 i> » » ventral fins 



Lat. lin 



Transv. lin 



a. b. c. (1. i e. 



199 



23,1 



8,0 



5,0 



10,0 



64,3 



16,5 



23,1 



20,3 



47,9 



45,7 



52 



11 



219 



23,2 



7,5 



5,0 



10,2 



63,9 



17,1 



24,6 



19,4 



50,6 



46,5 



55 



fl 



219 



23,2 



7,3 



5,0 



9,8 



64,8 



18,7 



25,5 



21,9 



47,9 



46,5 



54—53 



11 



252 9 



22,4 



11,2 



4,7 



10,3 



63,8 



16,2 



24,8 



19,0 



50,7 



45,6 



51 



11 



252 



23,4 



8,1 



4,5 



10,5 



58,7 



14,6 



21,0 



19,0 



50,0 



44,4 



53 



11 



Specimens h, c and e are caught in the Caspian Sea at 

 Petrovsk; a and d in the Volga delta. 



The most striking feature of the Caspian form of Leuc- 

 abramis seems to be the small number of scales in the lateral 

 line, which in the typical L. vimha contains 55 to 60 scales, 

 but in the Caspian only 51 — 55. In the same way the for- 

 mula of the transversal line in the typical form is -^ — -pr- 1 , 



S 9 



but in this one only — ^ — 1. 



The length of the head seems also to be greater in the 

 Caspian form as the percentage expressing this only in one 

 of the specimens raeasured is so low as 22,4, but else varies 

 between 23, i and 23,4. In the typical form the same per- 

 centage is, according to Smitt, 22,5 — 21,5. The length of the 

 base of the anal fin is, as a rule, smaller in the Caspian 

 variety 14,6 »o— 17, o (or in one specimen 18,7), than in the 

 typical form, according to Smitt, 18 — 19 %. The percentage 

 expressing the relation of the postabdominal length is often 

 smaller (about 1 % less) than in the typical form. The other 



