Delthyrium sentence example

delthyrium
  • Clarke the delthyrium.
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  • Terebratula, that type of opening is found in the young stages only; later a it becomes partly closed by two plates which grow out from the sides of the delthyrium.
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  • The two plates may meet in the middle line, and leave only a small oval opening near the centre for the pedicle, as in Rhynchonella; or they may meet only near the base of the delthyrium forming the lower boundary of the circular pedicle-opening, as in Terebratula; or the right plate may remain quite distinct from the left plate, as in Terebratella.
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  • The pseudo-deltidium (so named by Bronn in 1862) is a single plate which grows from the apex of the delthyrium downwards, and may completely close the aperture.
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  • Margin of delthyrium.
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