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 

 StepkanophyUia 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 Milne-Edwards to be Turbinolid, and allied to the genus Ihecocyathus. 



Stephanophyllta complicata perhaps comes nearest to Stephanophyllia cliscoides of 

 Milne-Edwards and Haime 1 from the London Clay. It differs in having a laminate 

 columella. In Stephanophyllia cliscoides 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' S., long. 132° 25' E. 129 fathoms. 

 Only two specimens, one adult the other very young. 



Stephanophyllia formosissima, Moseley (PI. IV. fig. 11 ; PI. XIII. figs. 6, 7 ; PI. 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 trabecular, 

 which have a general concentric disposition. The sej)ta are composed, like the remainder 

 of the corallum, of fused trabecular ; 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 lie 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 : Palseontological Soc, 1850-54, part 1, p. 34, 

 pi. ii. fig. 3. 



(ZOOL. CHALL. EXP. PART VII. 1880.) O 26 



