spirifer

Spi"ri*fer, n. Etym: [NL., fr. L. spira a coil + ferreto bear.] (Paleon.) Defn: Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side.

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