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220 NATUBAL HISTORY. 
Fig. 173. —The Sturgeon. 
Southern States of this country. The female deposits 
her eggs in the fresh water of rivers, and the young, 
when hatched, migrate to the sea. 
373. The family of Flat Fish differ in some important 
respects not only from all other fishes, but from all other 
vertebrated animals. The Turbot, Fig. 174, is an ex- 
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Fig. 174.—The Turbst. 
ample of it. These fishes are not ordinarily in the posi- 
tion that you see here, but lie flat along near the bottom, 
the upper surface in most species being of a dark color, 
while the lower surface is white. They have no air- 
bladder, and have little power of rising in the water. 
When they are disturbed they assume a vertical position, 
showing their white sides, and dart along with great 
