COIIFAIIMTVE STUDY OF SCOMUROID FISTIES. 



311 



Oll tlio (lorsiil, pjsfxnior p:irt \\c find fivo longitinliual ritiges or crests. Tho 

 median ridge is contiuiioiLS to tho occipital crest, separating the right and 

 loft lateral nuiscles, and affording the surface of insertion to the p'otnictor 

 dorsalis at the posterior part. The inner ridge or temporal crest of Starks 

 and cretes intermediäres of Cuvieh ari> found at the mid-dorsal bend <if tlio 

 epaxial p.irt of the lateral muscle, while the outer ridges or pterotic crests 

 seiKirate the lateral muscle from the fiicial muscles. 



In tho ScomliridiO tlie skull (fig. 30, a, b) is cjmparativoly high, bsiug 

 noarlj' as high as broad, and is gradually pointed tow.ards the anterior cud. 

 Tlie lateral ridges on the dorsal sides of the slvull converge forward, and 

 disappear near the posterior margin of the frontals. Moreover there is a i^air 

 of short, accessory crests on the external side of tho temporal crests. The 

 pterotic processes are stout, sluirply pointed and uouflexible. The temparal 

 and pt«rotic crests are separated by a deep furrow and are connected at the 

 ITostorior end with a nearly vortical lidge. Nearly the antarior half of the 

 skull is dü'ectly under the skin, and is not covered by tho lateral ninsclo. 



Fig. A. Median snsittal section o£ the skull. 1, Scomhcr japonictui; 2, GyUum niphonlum; 3, 

 Thunnus or'.entalls; i, Kalsuicotius pdainis. The first vertebra is nnehyloaed to the .skull of 

 r/junnus. 



