BROAD-NOSED STURGEON. 



53 



species found in the various waters of the Russian empire, 

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

 third volume of the Transactions of the Imperial Society of 

 Naturalists at Moscow ; nor am I able to say that it agrees 

 with either of the eleven species figured and described by 

 Messrs. Brandt and Ratzburg in their Medical Zoology. 



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. Supposing that the bony plates of the head 

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

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

 British Sturgeons, not without some suspicion, like Dr. 

 Pamell, that we may have even more than two. 



