PIETSCH: OSTEOLOGY AND RELATIONSHIPS OF TETRABRACHIUM 



Metapterygoid 



Eclopterygoid 



Hyomandlbular 



Palatine 



Figure 23. — Bnu-fnonu-hthys hirstilus: A. Medial view of lower 

 jaw. palatine bone, .suspen.sorium. interhyal. and opeixular appa- 

 ratus. AMS IA.6064, 69 mm SL; B. Medial view of palatine arch and 

 .suspense rium. right side, showing presence of a .small ectopterygoid. 

 UW 20769. 42 mm SL. 



Preopercle 



Subopercle 



Interhyal 



Interopercle 



Rrticular ' 



Metspterygoid 



Mesopterygoid 



Sympfectic 



Hyomandlbular 



Pilatim 



Dentani 



Irtlculir 



Interopercle 



Subopercle 



Preopercle 



Figure 24. — Medial view of lower jaw, suspensorium, 

 interhyal, and opercular apparatus of Chauna.x pictus, 

 UW 20770. 90 mm SL. 



Metapterygoid 



Mesopterygoid 



Dentary 



Ectopterygoid 



Preopercle 



Interopercle 



•rtlculir 



' Quadrate 



Subopercle 



Figure 25. — Medial view of lower jaw, suspensorium, inter- 

 hyal, and opercular apparatus of Dibranchus atlanticus, 

 MCZ 51257, 105 mm SL. 



403 



