Spirifer
Pronunciation : Spi"ri*fer
Part of Speech : n.
Etymology : [NL., fr. L. spira a coil + ferreto bear.] (Paleon.)
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913