10 



E. LÖNNBERG, THE ICHTHYOLOGY OF THE CASPIAN SEA. 



cording to Smitt/ varies between 41 and 43. In the same 

 way the least lieight is, in the former, 15, i % of the total 

 length, but in the latter only about 13, according to the au- 

 thority quoted. The length of the base of the dorsal fin is 

 34,5 % of tbe total length in the Volga specimen, but in 

 Swedish forms varying between 26 and 32. The base of the 

 anal fin is, however, comparatively a little shorter as the 

 percentage expressing its length is 11,9, but in Swedish spe- 

 cimens 12 — 13. The ventral fins are rather long in corres- 

 pondance with the great depth of body and the extension of 

 the dorsal fin. Their length is 19,7 % of the total length, 

 the same relation is in Sweden varying between 16 and 19. 

 In other respects the Volga-Carassius does not show any 

 remarkable differences. The formula of its scales is lat, lin. 

 31, transv. lin. f 1.^ 



in ?i of tot. length 



Tinca tinca (Lin.) 

 from the Volga delta. 



Total length 



Length of head 



Diameter of eye » 



Distance from snout to dorsal fin > 



Base of dorsal fin » 



Height j » s » 



Distance from snout to ventral fin » 



» » » » anal > » 



Base of » » » 



Height » i t i> 



Length » pectoral fins » 



» » ventral -^ ^ 



» > middle rays of caudal fin outside the scaly portion 



These relative measurements agree quite closely with 

 the corresponding ones from Swedish tenches; the only thing 

 that could be remarked is that the anal fin of the male spe- 

 cimen is larger than usual and the distance between the snout 

 and the dorsal fin a little shorter. 



' Scandinavian Fishes, Swed. Ed. II, p. 736. 



^ Ät Kura river I saw some large specimens of Bat-bus, but as I bad 

 neither opportunity of identifying the species nor of bringing them with me 

 this genus is omitted from the list. 



