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 Stephanophyllia florealis by development of synapticul ; 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 costae. The columella is a large oval spongy mass 
composed of fine trabeculz. 
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 their 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 Actiniadee Corallimorphus, 
(Moseley)." A zone of six somewhat larger tentacles succeeds this at a little 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 Stephanophyllia trom Ligurian Miocene 
deposits which closely resemble those of this species. Stephanophyllia 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 Actiniaria Dredged in the Deep Sea, with a Description of certain Pelagic Surface Swimming 
Species, Trans. Linn. Soc. Lond., 2 ser., Zoology, vol. i. p. 299. 
