spirifer

from The Century Dictionary.

• noun The typical genus of Spiriferidæ, having the long brachial appendages coiled into a pair of spirals, called the carriage-spring apparatus, supported upon similarly convoluted shelly lamellæ, and the shell impunctate, with a long straight hinge-line.
• noun A member of this genus.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun paleontology Any of numerous species of fossil brachiopods 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.