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Webster 1913 Edition
Spirifer
Spi′ri-fer
,Noun.
[NL., fr. L.
spira
a coil + ferre
to bear.] (Paleon.)
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.