All of the material of this family collected by the Siboga Expedition belongs to the 

 subfamily Briareinae. Ici/ogorj^ia, which has been placed by Studicr in the Spongioderminse, has 

 well-marked water-vascular canals in the axis and must therefore be included in the Briareina;. 



A definition which will sharply differentiate the family Briareidse from Sclerogorgidae, 

 and at the same time give the necessary diagnostic features, is offered as follows: 



Scleraxonia in which the spicules of the axis cylinder are either beset with distinct thorny 

 points or wart-like verrucce and are not possessed of horny sheaths by which they are agglutinated 

 together either directly or by cross connections. Branches consisting of a cortex containing the 

 calyces and an axis consisting of spicules closely packed in a matrix of connective ■ tissue. 



The amount of material collected by the Siboga Expedition and belonging to this family 

 is hardly sufficient to justify a general discussion of the generic groups. The writer will therefore 

 confine himself to a discussion of the genera represented. 



Synoptic view of the genera and species of Briareid.e 

 collected by the Siboga Expedition. 



New species are indicated l)y an asterisk (•■'). 



Solenocaulon. 



Solenocaulon stcrrokloniinn, S. grayi^ 

 S. *guercifori?ns, S. ycdanensis. 



Titanidium. 



Titanidmni *friadilis. 



Semperina. 



Sonpcrina riibra^ S. "^brunnea. 



Suberia. 



Silber ia köllikcri^ S. *excavata, 

 S. '*macrocalyx. 



Paragorgia. 



Paragorgia splcndcns. 



Iciligorgia. 



Iciligoi'gia oricntalls. 



S )' s t e m a t i c description of genera and species. 



Genus Solenocaulon Gray. 



Solenocaulon Gray. Annals and Magazine of Natural History, Series 3, Vol. X, 1862, p. 147. 



Solenocaulon Gentli. Zeitschrift f. Wissenschaft. Zoologie, Bd. 17, 1867, p. 428. 



Solenocaulon Studer. Monatsbericht der Königl. Akademie der Wissenschaften zu Berlin, 187S, 



p. 668. 

 Solenocaulon Wright and Studer. Challenger Reports, the Alcyonaria, 1S89, p. XWI. 

 Solenocaulon Brundin. Alcyonarien aus der Sammlung des Zool. Museums in Upsala, 1896, p. 12. 

 Solenocaulon Germanos. Gorgonaceen von Ternate, 1897, p. 145. 

 Solenocaidon Belage et Herouard. Traitc de Zoologie Concrete, II, 2, 1901, p. 412. 

 Solenocaulon Hickson. Alcyonaria of the Maldives, part I, 1903, p. 493. 

 Solenocaulon Thomson and Simpson. Alcyonaria of the Indian Ocean, II, 1909, p. 153. 



