The septa are in six systems and five complete cycles; their surfaces have the usual 

 rows of discrete granules. Those of the first three cycles are equal and alone forrn the colu- 

 mella ; their vertical margins are very strongly sinuous. Those of the fourth cycle descend as 

 low as the columella, but do not join it. Those of the fifth cycle do not descend halfway down 

 the calicular wall. 



Colour pale cinnamon, somewhat streaky. 



Height of corallum 15 millim.i major diameter of month of calicle 23 millim., minor 

 diameter 10 millim. 



This species, though its texture is much coarser and denser, seems to have its nearest 

 relative in F. laciniatuDi var. incssinii. 



44. Flabclhiin ? irregiilare Semper. 



FlabcUmn irregitlare Semper. Zeitschrift f. wiss. Zool. Rd. XXII, 1872, p. 242, pi. XVI. 

 fig- 7—17- 



Stat. 253. 5°48'.2S., 132° 13' E. 304 m. i Ex. 

 [Stat. 49'. 8°23'.5S., 119^ 4.6 E. 69 m. 2 Ex.] 



45. Flabelbim dens n. sp. Plate IV. Fig. 30, 30^. 



Stat. 95. 5°43'5 N. ii9°4o'E. 522 m. 9 Ex. 



Corallum elongate, narrowly conical, strongly compressed, without costse of any kind, 

 but with ver)- faint transverse growth-rings. The major axis of the calicular orifice, which is 

 as 125 is to 50, is on a very slightly lower plane than the minor. 



Calicular fossa very deep. Septa stout and strongly crimped ; those of the first three 

 cycles are equal, and unite to form the columella, those of the fourth cycle are about half the 

 depth of those of the first three cycles, while those of the fifth cycle are present in only a 

 few half-systems : consequently the usual arrangement of the septa is a large one alternating 

 with a small one. 



Height of corallum 16 millim. 



Major diameter of calicle 12.5 „ 



Minor „ , „ 5 



This species appears to be very nearly related to F. transversa I c Moseley (Challenger, 

 Deep-Sea Madreporaria, p. 1 74, PI. VI, Fig. 6). Another species to which it is closely related 

 is F. fastigatnvi Dennant (Trans and Proc. Roy. Soc. S. Australia, XXIII. 1898 — 99, p. 113, 

 PI. II, Fig. 2(7 — b) from the Tertiaries of Victoria. 



46. Flabellum japotiicttni Moseley. 



Flabclluvi japonicuin Moseley. Challenger Deep Sea Madreporaria, p. 168, pi. VII. fig. ^a, 

 pi. XVI. fig. 12. Marenzeller. Zool. Jahrbiicher, Syst. Abth. Ill, 1888, p. 45. — Alcock, 

 Investigator Deep Sea Madreporaria, p. 23. 



