Definitions
from The Century Dictionary.
- noun A genus of tubicolous worms which form spirally enrolled calcareous tubes cemented to some object by the flat lower side. The spiral may be dextral or sinistral, and is frequently ornamented with tubercles or spines. Tubes of this kind are found in Paleozoic rocks and thenceforward to the present seas.
Etymologies
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Examples
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Acacia spirorbis (or gaiac, as it is locally known) forest is found in somewhat drier habitats.
Vanuatu rain forests 2008
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The vegetation is often dominated by Acacia spirorbis and Leucaena leucocephala (an introduced species).
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A. hylonoma, A. polystachya, A. solandri, and A. spirorbis.
Chapter 8 1983
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A small tree, Acacia spirorbis may reach 15-20 m in height and often 40-60 cm in diameter.
Chapter 8 1983
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Acacia solandri is closely related to Acacia spirorbis (see below), and the two are expected to behave similarly.
Chapter 8 1983
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A. hylonoma, A. polystachya, and the two Pacific Island species A. solandri and A. spirorbis.
Chapter 9 1983
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