from The Century Dictionary and Cyclopedia

  • The name originally given by Agassiz to the family Acanthodid√¶ (which see).
  • In Agassiz's classification, an order of selachians or sharks having the endoskeleton and parts of the skull calcified; pterygoquadrate articulated with the cranium and sometimes bearing teeth; fins, except the caudal, with stout anterior spines; and shagreen scales quadrate and compactly arranged.


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