Definify.com

Webster 1913 Edition

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.

See also: Spirifer

spirifer ‎(plural spirifers)

(paleontology) Any of numerous species of fossil brachiopods of the genera †Spirifer and †Delthyris and allied genera in order †Spiriferida, in which the long calcareous supports of the arms form a large spiral, or helix, on each side.