OF NEW SOUTH WALES. 19 



appearing like somewhat sharp keels or ridges ; but in the only 

 specimen seen by me, the base is so incrusted with calareous 

 algse in thin lamellae, that very little can be seen below the edge 

 of the calicular margin; calice, subpentagonal, but irregular; 

 septa, very high and falcate, concentrically undulately striate, in 

 five systems of three cycles, with the rudiments of a fourth ; 

 secondaries, thin in long arched lobes, which very much overhang 

 the edge of the calice ; primaries, tall and straight, not exsert, 

 but reaching more towards the centre of the fossa than any others ; 

 tertiaries, small, thin, nearly as much exsert as the secondaries, 

 and inclined or curved towards each other outside the wall ; 

 fourth order present in two systems only as thin short exsert 

 lamellas ; tubercles representing a fifth order in one system ; fossa 

 deep and narrow ; wall thick and indented inwards by the side 

 of the primaries. Alt. 10, width from the extreme ends of the 

 secondary septal lobes 15 mill. Fiji 20 fathoms, from a bay near 

 Levuka, Dr. Rayner. In the Macleayan Museum. 



From the incomplete character of the septa, on which few or 

 no granules are visible, it is evident that this is only a young 

 specimen. There is, however, nothing in the coral to give rise to 

 the suspicion that the quinary arrangement is due to abortion. 

 The form is peculiar and exceedingly interesting, and no doubt 

 when other specimens are found, the characters of the adult will 

 modify some of the characters which are now described. 

 Family Fdngid^, Sub. Fam. Lophoserin^. Genus Ctcloseris. 



This genus, which in addition to living species, extends as far 

 as the cretaceous rocks as a fossil, is represented at present by 

 G. cyclolites, and G. hexagonalis, and G. sine^isis on the Barrier 

 reef of north eastern Australia. Only the first has hitherto been 

 regarded as Australian. They are small corals, like mushrooms, 

 distinguished from Fungia by the wall being neither perforate 

 nor hispid. In Gycloseris there is no epitheca. In G. cyclolites 

 the disk is very high in proportion to its diameter ; in 

 0. hexagonalis it is extremely thin, larger than the last, and 

 hexagonal in the young stage. G. sinensis is three times as^thick 

 as the last, though nearly as large. I doubt very much whether 

 the two species can be separated. They have both from 7 to 8 



