202 THE VOYAGE OF H.M.S. CHALLENGER. 



periphery of the corallum forming six deltoid masses of septa. The tertiary septa forming 

 the sides of these deltoid masses are bent over, sloping away from the primary septa, so 

 that at the apex of the delta the upper margins of these tertiary septa use and cover 

 over the inner ends of the secondary septa. There is no separation of the septal inter- 

 spaces into chambers as in StephanophyUia florealis by development of synapticuke ; but 

 the quaternary and quinary septa are more or less bent over above, so as to fuse along 

 part of their upper margins and roof in the spaces between them. The septa correspond 

 to the interspaces between the costas. The columella is a large oval spongy mass 

 composed of fine trabecules. 



In the living animal the disc is of a madder red colour, much darker towards the 

 margin of the calicle, where it is marked by vivid green emerald stripes, which pass on 

 either side of the bases of the outer tentacles. The margin of the mouth is white. 

 The corallum is conspicuously white, and since the coloured parts of the soft tissues do not 

 extend to its very margin, the tissues being there scanty and transparent, this margin 

 shows out as a white zone surrounding the dark coloured central parts of the coral. 

 The tentacles are conical, with rounded knobs at then tips. Their arrangement is shown 

 in figures 8 and 9, Plate XVI. Tentacles of five orders in size are to be distinguished 

 disposed symmetrically at regular intervals from the centre of the disc. Nearest the 

 mouth, at about two-thirds the distance from the centre of the disc to the margin of 

 the corallum, is a circlet of six tentacles situated over the primary septa. A distinction 

 of six primary tentacles from the rest by position is not uncommon in corals, even where 

 the distinction between primary and secondary septa is not much marked. A similar 

 disposition of tentacles occurs in the deep-sea genus of Actmiadse Corallimorphus, 

 (Moseley). 1 A zone of six somewhat larger tentacles succeeds this at a kittle distance 

 nearer the margin of the corallum ; these tentacles are placed over the secondary septa. 

 A zone of twelve smaller tentacles succeeds these, being placed on the septa adjoining 

 the secondaries on either side. In addition three more still smaller tentacles intervene 

 between each primary and secondary septum. There are sixty tentacles in all. The 

 tentacles of the inner zones are white, with dark madder tips, the outer smaller tentacles 

 of a light madder colour. The fresh specimens obtained, both off the Ki Islands and off 

 the Philippine Islands, agreed closely in their colouring in all details. There are in the 

 Turin Natural History Museum specimens of a StephanophyUia from Ligurian Miocene 

 deposits which closely resemble those of this species. StephanophyUia elegans (Michelin) 

 is evidently very near the present species, but in it the septa are much higher at their 

 outer ends, and more completely fused together. 



Extreme diameter of the largest specimen, 39 mm. Extreme height, 11 mm. Smaller 

 specimens measure 25 mm. and 20 mm. respectively. 



1 On New Forms of Adiniaria Dredged in the Deep Sea, with a Description of certain Pelagic Surface Swimming 

 Species, Trans. Linn. Soc. Lond., 2d ser., Zoology, vol. i. p. 299. 



