Class IV. COMMON STURGEON. I69 



to the vent, is flat; on the back, not remote 

 from the tail, is a single fin ; it has besides two 

 pectoral fins, two ventral, and one anal fin ; 

 the tail is bifurcated, but the upper part much 

 longer than the lower. The upper part of the 

 body is of a dirty olive color ; the lower part 

 silvery ; the middle of the tubercles white. 



In the manner of breeding it is an exception 

 among the cartilaginous fish, being like the bony 

 fish oviparous, spawning in winter. 



