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Virgularian

Definition: Any one of numerous species of long, slender
Alcyonaria belonging to Virgularia and allied genera of the family
Virgularidae. These corals are allied to the sea-pens, but have a long
rodlike rhachis inclosing a slender, round or square, calcareous axis.
The polyps are arranged in transverse rows or clusters along each side
of the rhachis.