STURIONA. 



159 



Order III. STURIONA. 



Gills free, as in the Bony Fishes, protected by a 

 gill-cover, and opening by a single wide orifice, on 

 each side. 



Chimcera (Linn.). Gill-cover rudimentary; gills 

 partly attached: tail ending in a long filament ; 

 two dorsals, the first high and short, the second 

 low and long ; skin smooth. 



C. monstrosa. Fig. 238 ; J- n. s. 



238 



Acipenser (Linn.). Sturgeon. Body angular, the 

 angles carrying bony plates ; snout pointed^ fur- 

 nished with filaments ; mouth tubular, without 

 teeth; gill-cover broad, bony; tail two-lobed, 

 unequal. 



A. sturio. 



latirostris. Fig. 239 ; fen-s. 



