E. T. NEWTON ON FISHES TAILS. 



83 



Various Stages in the Development op the Tail of the 

 Flounder. After Prof. Alex. Agissiz. — n, Notochord; in 

 Figs. 11 and 12 this is ossified to form the Urostyle; c, 

 Embryonic Caudal fin ; h, Hypural plates. 



