THE GORGONACEA OF THE SIBOGA EXPEDITION 



IV. THE PLEXAURID.E 



BY 



C. C. NUTTING, 



Professor of Zoology, State University of Iowa. 



With 4 plates. 



(Aided by a grant from the ELIZABETH THOMPSON SCIENCE FUND.) 



Family PLEXAURID^E Gray. 



Plexaura Lamouroux. Exposition Methodique, 1821, p. 35. 



Plexaurida Gray. Annals and Magazine of Natural History, Series 3, Vol. IV, 1859. 



Eunicea + Plexaura Milne Edwards et Haime. Histoire naturelle des Coralliaires, 1857, Vol. I, 



pp. 146, 152. 



Eimiceidie Kolliker. Icones Histologicae, II, 1865, p. 137. 



Plexaurida Verrill. Transactions Connecticut Academy of Science, Vol. I, 1869, p. 135. 

 Euniceidu! Ridley. Annals and Magazine of Natural History, Series 5, Vol. n, 1883, p. 253. 

 Plexaurid<z Wright and Studer. Challenger Reports, the Alcyonaria, 1889, p. 135. 

 Plexaurida; Studer. Alcyonarien aus der Sammlung des Naturhistorischen Museums in Liibeck, 



1894, p. in. 

 Plexaurida Brundin. Bihang til Svenska Vet.-Akad. Handlingar, Band 22, Afd., 17, N 3, 



1896, p. 17. 

 Plexaurida Thomson and Henderson. Ceylon Pearl Oyster Report, Alcyonaria, 1905, p. 304. 



The original definition of the family, as given by GRAY, is as follows: 

 "Bark granular, persistent, cork-like, without any important grooves. Cells placed equally 

 on all sides of the branches". 



SIBOGA-EXPEDITIE XIII '. I 



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