delthyris definition

  • noun:
    • A name formerly directed at particular Silurian brachiopod shells of this genus spirifer.
    • 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.
    • A name formerly fond of specific Silurian brachiopod shells associated with genus spirifer.
    • A subgenus of Paleozoic brachiopods, obtaining the general figures associated with the genus Spirifer, however with the top of layer covered with good concentric lamellæ.

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