40 



though much thinner and frailer, are singularly free from perforations and their edges, though 

 wavy and jagged, are not dentate : those of the first two cycles are as high as, or even higher 

 than, any of the others. 



62. SiephanopJiyllia complicata Moseley. 



Stephanophyllia complicata Moseley. Proc. Roy. Soc, 1876, p. 5 5 8, and Challenger Deep Sea 

 Madreporaria, p. 198, pi. IV, fig. 2, pi. XIII, figs. 3 — 5. 



Stat. 59. io°22'.7S., i23°i6'.5E. 390. m. 3 Ex., (dead). 

 Stat. 256. 5°26'.6S., I32°32'.5E. 397. m. i Ex., (dead). 



These are small dead specimens: the one from Station 256 is certainly this species, 

 but there is some doubt about the others which are considerably damaged. The)- were dredged 

 in nearly the same place as the "Challenger" specimens. 



63. SiephanopJiyllia fnngiiliis n. sp. Plate Y. Fig. 35, 35^ — b. 



Stat. 100. 6°ii'X., I20°37'.5E. 450 m. 5 Ex., all dead. 



As in S. complicata and certain other species, the columella ("which is a stout upstanding 

 lamina) stands in a star-shaped fossa, and each ray of the star is bisected by a primary septum. 



Corallum of coarsish texture, circular, without trace of adherence, the under surface or 

 wall flat or only very slightly convex, the upper surface very strongly and evenly convex. 



Gestae of equal size, distinct from centre to edge of disk, bifurcating again and again until 

 they become 96 in number. The perforations between the costae form over 20 concentric rows. 



Septa strongly convex, coarsish, with the edge more or less crenate, in six systems and 

 five complete cycles. Those of the i*' cycle are independent, except that they are united with 

 the immediately-adjacent quinaries by a few trabeculae. 



Perhaps the most conspicuous of all the septa are the two quinaries in each s)stem 

 which lie next to the primaries that bound the system : these quinaries curve inwards and finally 

 unite with each other in front of the secondaries, a paliform nodule often marking the point 

 of junction. The two outermost quinaries in each system form, in fact, a delta so connected 

 with the septa of all the other cycles (except the independent primaries) that these appear to 

 arise from the delta by a series of successive and very regular bifurcations. 



The caHcular space not included within the deltas has the form of a beautifully-regular 

 six-rayed star, each raj- of which is longitudinally bisected b)- a jjrimary septum. 



The columella is a stout vertical plate, the free edge of which may be entire or crenate. 



The shallow calicular fossa, the sides of the columella, and the edges of the septa are 

 sometimes studded with coarse orranules. 



The diameter of the largest specimen is 15 millim. 



This species is closely related not onl)- to S. complicata Moseley (from which it is 

 distinguished by the characteristic predominance of the outermost quinaries of each sjstem), but 

 also to 5. implexa Dennant, from which it differs emjihatically in having a stout laminar columella. 



