220 



NATUKAL HISTOKY. 



Fig. 173. —The Stm-gcon. 



Southern States of this country. The female depoEita 

 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 Tuvbot, Fig. 174, is an ex- 



Fig. 1T4.— The Turbot. 



ample of it. These fishes are not ordinai-ily 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 



