from The Century Dictionary.
- 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.
- The name originally given by Agassiz to the family Acanthodidæ (which see).
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