COXIP.VR.VTn'E SrUDY OV SCOMBROID FLSIIIÄ 



335 



ixartiuii ill Icnj^Hi. llie 

 l^xjstcrior styliform process 

 is rather short. In Gymno- 

 sarda the cxtcrruil wing 

 of the anterior external 

 iwrtion is turned obliquely 

 towards the external, ven- 

 tral side, and is not thicken- 

 ed nor folded at the 

 extenml margin. In the 

 Thunnidae the pelvic girdle 

 is very strongly developed. 

 The anteiior external por- 

 tion is broad, rather thick, 

 and the dorsal exterior 

 margin is also thick and 

 folded. In this family the 

 external and ventral wings 

 of the anterior external 

 portion are nearly in one 

 pLtnc, and the internal 

 wing is united to the 

 middle of the plane, formed 

 by the other two wngs. 

 The external wing is folded 

 at the external margin. The anterior internal portion is a little longer than the 

 venti'al wing of the anterior external portion. In the Katsuwonidae the pelvic 

 girdle is more specialized. The anterior extenml portion is thin, and fan-shaped, 

 with a thick extenml margin. The anterior internal portion is more or less longer 

 than the outci', especially in Euthynnus and Auxis. The styhform process is very 

 long and laterally compressed. Fin-rays are directly articulated to the thick 

 ^»rtiou where the three diffei'ent portions of the ai'ch meet. 



SfOH.&er }aj)on\f,us 



Cybium niphonium 



Saräa orienialis 



Gymnosarda nuda 



Thunnus oriental is 



Katsvwonvs pdamis 



Aux'ix maim 



Fig. L Ltft external view of the pelvic gir<ile. 



