SCHEME OF CLASSIFICATION 



Family. 

 Triacanthidae (p. 722). 

 Triodontidae (p. 723). 

 Balistidae (p. 723). 

 Ostraciontidae (p. 724). 

 Tetvodoiitidae (p. 726). 

 Diodontidae (p. 726). 

 Molidae (p. 726). 

 Ctenodoiitidae (p. 505). 

 Uroncmidae (p. 607). 

 Ceratodontidae (p. 607). 

 Lepidosirenidae (p. 511). 



OF UNCERTAIN POSITION 



Palaeospondtlibats {^. 521). 



OSTRACODERMI (p. 522) 



Antiarchi (p. 532) 

 Arthrodira (p. 535) 



Heterostbaci (p. 524) 



OSTEOSTRACI (p. 527) 



Anaspiba (p. 531) 



Family. 



(Coelolepidae (p. 524). 

 Drepaiiaspidae (p. 526). 

 Fsavimosteidae (p. 626). 

 Pteraspidae (p. 527). 

 r Atelcasjndae (p. 528). 

 -,' Cephalaspidae (p. 5281. 

 [ Tremataspidae (p. 530). 

 Birlceniidae (p. 531). 

 Asterolepidae (p. 534). 

 Coccosteidae (p. 536). 



