Definitions
from The Century Dictionary.
- noun A subgenus of Paleozoic brachiopods, having the general characters of the genus Spirifer, but with the surface of the shell covered with fine concentric lamellæ.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Zoöl.) A name formerly given to certain Silurian brachiopod shells of the genus
spirifer . - noun (Geol.) one of the divisions of the Upper Silurian rocks in New York.
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