Figxire 152.— Acanthost 

 quadricomis: posterior views 

 skull (left) and of orbit (right) ( 

 section of skull: dashed lines represent 

 cut surfaces of frontals, pterosph( 

 prootics, and parasphenoid). composite 

 based on several specimens, 

 58.2-350 mm SL, Gulf of Mexico 

 and Caribbean. 



Figure l53.—Acantho»tracion 



quadricomia: lateral (to left) and 



medial views of palatopteroquadrate 



region, composite based on several 



specimens, 58.2-350 mm SL, 



Gulf of Mexico and Caribbean. 



Figure \5i.—Acantho8tracion 

 quadricornig: (left) lateral view of 

 occipital region of skull and the 

 fused five abdominal verte- 

 brae; (right) posterior view of 

 fused first five abdominal vertebrae; 

 77.7 mm SL, Florida. 



