The calyces are long and slender, closely approximated, and set at right angles with the 

 branches, and grow on all sides of the latter. They often tend to curve upward, especially at 

 their distal ends. The individual calyx is about 5 mm. long, on the average, from base of 

 calyx to base of tentacles. The greatest diameter is about 2 mm. near the distal end, and the 

 least diameter is about 1,5 mm. The fringe of long spicules constituting the "crown" are quite 

 conspicuous, and there are a number of other conspicuous points arising from the calyx walls 

 and pointing upward and outward. There are also a number of bristling points projecting from 

 the upper surface of the infolded tentacle. 



These spicules, together with those of the crown, form a bristling tuft which must prove 

 an effecting defense to the polyps. 



Spicules. Almost all of the spicules are bent, warty spindles. Those around the calyx 

 margins are decidedly longer than the others, sometimes attaining a length of 2 mm. and often 

 placed in pairs immediately over the tentacle bases, the two of a pair being closely approximated 

 throughout. The spicules on the calyx walls are arranged en chevron, while those on the 

 stem and branches are longitudinally placed. The spindles are well tuberculated, the tubercles 

 often being arranged in annular bands. 



C o 1 o r. The color is very light brown throughout, the tentacles appearing darker as 

 they show between the spicules. The axis is a darker brown, and the spicules colorless. 



The specimen above described has been compared directly with a portion of the type 

 from the Challenger collection, and agrees with it quite closely, except that the calyces appear 

 to be somewhat more closely approximated than in the type. 



The type specimen of this species is in the British Museum. It was collected from off 

 Port Grappler, Patagonia. Depth 140 fathoms. 



1 *2. Acanthogorgia armata Verrill. (Plate XIX, fig. 1). 



Acanthogorgia armata Verrill. American Journ. Sci. and Arts, XVI, 1878, p. 376. 



Accmthogorgia armata Verrill. American Journ. Sci. and Arts, XVIII, 1884, p. 220. 



Acanthogorgia armata Verrill. Buil. Mus. Comp. Zool., Vol. XI, N° 1, 1884, p. 31. 



Acanthogorgia armata Hickson. Alcyonaria of the Cape of Good Hope, Part II, 1904, p. 225. 



Acanthogorgia armata Nutting. Alcyonaria of the Hawaiian Islands, 1908, p. 580. 



West Coast of Pulu Weh, Sumatra. 40 fath. Found on cable, Aug. 17, 1908. Van NOUHUVS don. 



Colony indistinctly flabellate in form, 10 cm. in height. The main stem gives off a branch 

 about 1,5 cm. from its base, another about 2 cm. above this, and still others above the latter 

 point, the tendency being toward an obscure geniculation of the main stem. These branches often 

 again branch in an obscurely alternate manner, occasional branches of the third order being 

 seen. The calyces are set at right angles to the stem and branches, are closely approximated, 

 and seem to be equally distributed on all sides of the stem and branches. I am unable to 

 make out any definite spiral arrangement; but there seems to be a tendency for the calyces 

 to arrange themselves in four rows, particularly toward the distal parts of the colony. 



1 As in foimer reports the species not obtained by the Siboga are indicated by asterisks. 



