120 MR. C. W. ANDREWS AND OTHERS ON THE [Feb. 20, 



specimens, in which the septa appear to run distinct to the 

 columella, under the older generic name. 



The specimens are both low groups of calicles rapidly budding, 

 and in one case dying away beneath the living cluster, but in the 

 other rising on a pedestal 2-3 cm. high, and on one side bare of 

 polyps. 



Occurs in rock-pools under the cliff on the south side of Flying 

 Fish Cove. 



Genus Madrepora. 



Madrepora (Isopoha) brooki, sp. n. 



Corallum with typical growth, viz., a thick common base from 

 which 3 or 4 stout flattened branches radiate outwards, with an 

 upward curve. The tip of each branch expanding and branching 

 again. [The branches are 3-4 cm. thick and 4-0 wide, but as 

 the coral is continually thickening these measurements are of no 

 classificatory importance.] 



Certain of the calicles on the tops of the branches or of knobs 

 are thin and cylindrical, and may be as much as 4-5 mm. long by 

 2*5 in diameter, and among these are others of all lengths but 

 with one side cut down ; the larger are nearly complete, the shorter 

 are purely scoop-shaped. Here and there these incomplete calicles 

 appear grouped irregularly round a complete calicle. The whole 

 of the rest of the stock, except on the undersides of the branches 

 (which are warty and nearly bare of calicles), is thickly covered 

 with scoop-shaped calicles of all sizes and turned all ways, the 

 majority looking upward : many are mere punctures on the surface 

 with a slightly raised margin, others have one edge protuberant 

 like a lip ; from this all stages are found up to the long scoop- 

 shaped calicle. The calicles show no special feature, their costal 

 ridges are regular, smooth, and not prominent ; the whole wall in 

 the larger calicles rapidly solidifies. The interstitial coenenchynia 

 fills up as systems of floors supported on long spines like that 

 typical of Astrasopora. The smaller calicles are lighter and more 

 openly reticular. 



There is one large complete specimen, two fragments from other 

 stocks, and a branch worn smooth, yet recognizable by the section 

 which shows the peculiar interstitial coenenchyma. The species 

 differs not only in growth-form, but in size and characters of the 

 larger tubular calicles, from all the members of the subgenus 

 described by Mr. Gr. Brook in the British Museum Catalogue of 

 Madreporaria, vol. i. 



The large specimen was brought up from 11 fathoms by the 

 sounding-lead in Flying Fish Cove. Much of the shore cement 

 seems to be made up of rolled fragments of this madrepore. 



Madrepora (?) clathrata Brook. 



Madrepora clathrata Brook, Brit. Mus. Madr. i. p. 49, 

 pis. v. & vi. 



There are several fragments, one a long branching stalk (13 cm. 



