EPIOTIC 



FISHERY BULLETIN: VOL. 82, NO. 4 



SUPRAOCCIPITAL CREST 



PARIETAL 



FRONTAL 



ETHMOID 



VOMER 



LATERAL ETHMOID 



PTEROSPHENOID PARASPH 



PTEROTIC 



INTERCALAR 



FIRST VERTEBRA 



EXOCCIPITAL 

 PROOTIC 



a 



FIGURE 14. — Skulls in lateral view. a. Scomberomorus commerson, Coffs Harbour, New South Wales, 1,155 mm FL. b. 

 Scomberomorus munroi. Cairns, Queensland, 800 mm FL, USNM 219372, paratype. 



have the next highest crests. 



ETHMOID REGION. —This region is composed 

 of the ethmoid, lateral ethmoid, and vomer. The 

 nasal bone lies lateral to the ethmoid and lateral 

 ethmoid and, therefore, is included here. 



Ethmoid. — The ethmoid (dermethmoid) is a 

 forked median bone overlapped by the frontals 

 above and bounded by the vomer and lateral 

 ethmoid ventrally The concave anterior surface 

 articulates with the ascending process of the 



premaxilla. At its anterolateral aspect, the eth- 

 moid bone supports the nasals. 



In Scomberomorus, only the most anterior part 

 of the ethmoid bone is exposed in dorsal view, 

 while the rest of it is overlapped by the frontals. 

 In Acanthocybium, only the lateral aspects of 

 the bone are overlapped by the frontals and a 

 V-shaped dorsal median portion is exposed. The 

 ethmoid bone is longer in A. solandri than in 

 Scomberomorus. 



Lateral ethmoid. — The lateral ethmoids (par- 



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