Classification of the Scombruid Fishes 



73 



Family 1. Palseorhynchidse. 



Vertebrai 50 to 60 in number ; pelvic fins 6-raye(l. Neural 

 and liEeraal spines with thin posterior laminar expansions. 

 Scales, if present, thin and cycloid. 



PaUeorhynchiis and Hemirhijnchus from Eocene, Oligocene, 

 and Miocene deposits. 



mx 



d 



Dia'^r.ams sho^ino- the structure of the rostrum in Acanthocybium («) 

 "" Histiophorus {h), Xiphias (c), and Xiphiorhynchm {d). ^ 

 pr«>.miixinary ; mx, maxiUary ; na, nasal ; dh, > thuioid ; 

 fr, IVdutal. 



pm.i 



