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Chapter 33 ARTHRODIRES
The Arthrodires.-Another large group of extinct fishes mailed and helmeted is included under the general name of Arthrodira[157] (?ρθρο?, joint; δε?ρα, neck), or Arthrognathi (?ρθρο?, γν?θο?, jaw), the latter term recently framed by Dr. Dean with a somewhat broader application than the former.
These fishes differ from the Ostracophores, on the o
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