58 Head — True Fishes 



I. One or both jaws elongated 

 Page 59, figs. A-K 



la. Both jaws elongated 

 Page 59, figs. A-D 



See Needlefish, Billfishes, p. 102. 



lb. Only one jaw, upper or lower elongated 

 Page 59, figs. :^G, H-K 



See HEAD— TRUE FISHES, p. 60. 



II. Jaws not elongated 



See HEAD— TRUE FISHES, p. 62. 



