174 FISHES. 



filaments have grown to a great length. At a third stage, 



Fig. 89. — Young Sword-fish (Histiophorus), 9 mUl. long. 

 Atlantic, (Magn.) 



Fig. 90. — Young Sword-fish (Histiophorus), 14 mill. long. 

 South Atlantic. (Magn. ) 



when the fish has attained to a length of 60 millimetres, 



Fig. 91. — Young Sword-fish (Histiophorus), 60 mill. long. Mid-Atlantic. 



the upper jaw is considerably prolonged beyond the lower, 



