nuoAn-NOSKD sturokon, 



53 





species found in tlic various waters of tlic Russian cmjiirc, 

 figured and briefly described by M. A. Lovctski, in the 

 third volume of the Transactions of tlie Imperial Society of 

 Naturalists at Moscow ; nor am I al)]e to sav that it agrees 

 with either of the eleven species figured and described by 

 Messrs. Brandt and Ratzburg in their Medical Zoologv. 



Baron Cuvier has observed in his Regne Animal, t. ii. p. 

 379, note, that the species of this genus are not yet well de- 

 termined by naturalists, nor their comparative characters suffi- 

 ciently defined. Su])posing that the bony i)lates of the head 

 bv their form, size, and relative situation might afford specific 

 cliaracters, I have given two views of these parts in our two 

 British Sturgeons, not Avithout some suspicion, like Dr. 

 Parnell, that we may have even more than two. 



