PLATE 45. 



CENTRACIONTIDAE . 



Fig. 1-6. Centracion fr.\ncisci (Page 186). 



1. Teeth and jaws of a very young specimen. 



2. Upper jaws and teeth ot the same. 



3. Lower jaws and teeth of the same. 



4. Jaws and teeth of a larger specimen. 



5. Upper jaws and teeth of the same. 



6. Lower jaws and teeth of the same. 



The teeth of the very young Centracion are all raptorial; they attest a soft-bodied food at this 

 stage, and a probable ancestry in forms with cuspidate teeth. The larger specimen shows the widening 

 of the hindmost teeth in preparation for the development of the grinders. 



