38 E. LÖNNBERO, THE ICIITHYOLOlJY OF THE CASPIAN SEA. 



the length of head and the postorbital resp. 68,5 and 63,4 % 

 of the same length. This indicates a rather great variation, 

 hut it is in this case only individual. The sturgeons of this 

 region are, however, of great in terest and a thorough study 

 of them would be of great value to the ichthyological science. 



