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from The Century Dictionary and Cyclopedia

  • n. A genus of fossil chimæras or selachian fishes of the order Holocephali, having a depressed or elongated trunk, the head produced in a long, slender snout on which there is a prehensile spine in the males, tapering tail, and calcified vertebral rings. Specimens of S. polyspondyla occur as nearly complete skeletons in the Lower Lias of Lyme-Regis, England.


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