20 E. LÖNNBERG, THE ICHTIIYOLOdY OF THE CASPIAN SEA. 



differences occur only in single specimens and can therefore 

 be omitted. 



The Caspian Leucabramis has by some authors (GtMELIN, 

 Pallas, Eichwald, Kessler) been regarded as a distinct spe- 

 cies and called J./»amy".y (resp. Cyprinus) 2^crsa. Kessler points 

 ont the difference in the nuraber of scales in the lateral line, 

 l)nt EiCH\yALD's figure shows about 60 scales in the lateral 

 line. I suppose, however, that this is a mistake. The dif- 

 ferences between the northern and southern forms seem, how- 

 ever, to be rather too slight for the foundation of two dif- 

 ferent species. The Caspian form is also related to the fotm 

 called by Heckel Äbramis mélanops which also, no doubt, can 

 be reduced to a subspecies or variety of the typical rimha. 

 In the subspecies pcrsa as well as in mélanops the axis of 

 the bod}'' crosses the lateral line at the ninth scale from the 

 head, but in the typical rimha at the twelfth scale according 

 to Heckel. This is, however, variable as I have seen the 

 axis cross the lateral line at the tenth scale in a Swedish 

 rimha. 



As is indicated above it belongs to the fishes which in- 

 habit the sea itself; which may be concluded from the fact 

 that I collected specimens on the open coast, near Petrovsk, 

 among herrings. 



Abramis (Blicca) blicca Bloch 

 from the Volga delta. 



Total length 192 



Length of head in % of total length 22,3 



Diameter of eye » > » » i 



Postorbital length > » s » ^ 



Praeorbital ^ » » » » i 



Height of body » » » > ! 



Least height of caudal peduucle » » .» » j 



Distance between snout and dorsal fin » » » » ■> 



Length of base of dorsal fin » » 3. » > 



Height of ' i » » » > I 



Distance between snout and anal fin » > » > ; 



Length of base of anal fin » » » > i 



Height of > » » » j > 1 



