Corallium nobile appears to be the exception to this rule, as it is stated that colonies and even individual zooids are occasionally hermaphrodite. Lacaze Duthiers, "Hist. Nat. du Corail," 1864, p. 127.
G. Lindström, Handl. k. Svensk. Vet. Akad. xxxii. 1899.
J. W. Gregory, Proc. Roy. Soc. lxvi. 1899, p. 291.
G. C. Bourne, Lankester's Treatise on Zoology, pt. ii. 1900, "Anthozoa," p. 26.
E. M. Pratt, Fauna and Geogr. Maldive Archip. ii. pt. i. 1903, p. 516.