Category: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.