REPORT ON CORALS—DEEP-SEA MADREPORARIA. 201 
secondary septa smaller than the tertiary, and in which the tertiary septa fuse together 
in front of the secondary, which do not reach the centre. The coral, in fact, resembles 
Stephanophyllia suecica, a fossil from Ignaberga, Sweden ; but in this coral the columella 
is rudimentary. On the other hand, Quenstedt’s Stephanophyllia florealis has been 
supposed by Mile-Edwards to be Turbinolid, and allied to the genus Zhecocyathus. 
Stephanophyllia complicata perhaps comes nearest to Stephanophyllia discoides of 
Milne-Edwards and Haime* from the London Clay. It differs in having a laminate 
columella. In Stephanophyllia discoides the columella is papillose and circular. In 
Stephanophyllia nysti (M.-Edw. and H.), from Miocene formations at Antwerp, there 
is a similar fusion of septa to that occurring in Stephanophyllia complicata; but in 
this species the columella is almost absent. 
Dimensions : of an adult specimen—extreme diameter, 1°7 cm. ; extreme height from 
the summit of the columella to the centre of the base, 7 mm.: Of the young specimen— 
extreme diameter, 6 mm. ; height, 3°5 mm. 
Station 192, off the Ki Islands. Lat. 5° 42’ %., long. 182° 25’ E. 129 fathoms. 
Only two specimens, one adult the other very young. 
~ 
Stephanophyllia formosissima, Moseley (Pl. IV. fig. 11; Pl. XIII. figs. 6, 7; Pl XVI. 
figs. 8, 9). 
Stephanophyllia formosissima, Moseley, Proc. Roy. Soc., 1876, p. 561. 
The corallum is discoid, with the base flat in the centre and slightly curved towards 
the margin. It is white, and very light and fragile, much more so than in Stephano 
phyllia complicata, being composed of a fine trabecular network, through which the light 
penetrates freely, as through a fine sieve, when the coral is held up to it. The base is 
composed of a series of fine, radiating, costal rods connected by transverse trabecule, 
which have a general concentric disposition. The septa are composed, like the remainder 
of the corallum, of fused trabeculae; but these are stouter than those composing the 
base, and more perfectly fused, so as to form, in most regions, continuous plates pierced 
by rounded perforations. There are six systems of septa and five cycles. The upper 
margins of the septa rise in a curve from points distant a short space from the margin 
of the calicle, and, ascending to some height above the leval of the base, sink down again 
internally to the wide, oval fossa occupied by the columella. The primary and secondary 
septa are straight. Their upper margins he at a lower level than those of the remaining 
septa, and are only very slightly toothed. The primary septa are free from adherence. 
The margins of the tertiary, quaternary, and quinary septa are deeply dentate, the teeth 
being curved towards the columella. The quinary, quaternary, and tertiary septa fuse 
with one another laterally and by their upper margins at successive distances from the 
1 MM. Milne-Edwards and Haime, British Fossil Corals. London: Palzontological Soc., 1850-54, part 1, p. 34, 
pl. ii. fig. 3. 
(ZOOL. CHALL. EXP.—PART VII.—1880.) G 26 
