MALAYAN PORITES. 183 
as a thick cushion-shaped edge, 30 cm. across; above this the stock is a low conical mound 
rising into humps all over the top, but smoother round the periphery, where the mass is 
freely expanding. Large portions of the dead previous growths are again rotten. 
On the under surface the calicles are shallow and funnel-shaped, and the internal 
skeleton consists of several concentric rings of very echinulate granules which diminish in size 
towards the centre. The wall granules are distinct from those forming the median ridge, the 
septal granules, pali, and central tubercle are usually distinct, separated by concentric troughs 
and radial interseptal loculi. 
b, Zool. Dept. 98. 12. 1, 29. 
ce. Is like 6, only not so large; the mass supporting the umbrella-shaped stock, consisting 
of the previous growth, appears to have rolled over, and upon it the large expanded stock 
is perched. It is said to be from West Singapore. 
C Zool. Dept. 93. 7, 22. 21. 
Compare the method of growth of the next form, and especially the texture of the 
tips of the humps or processes. On the expansion of thick free edges, compare P, Ceylon 
1-8 (Pl. XXXV. figs, 29, 30, 31). 
184. Porites Singapore (72. (P. Singaporensis secunda.) (Pl. XXVIII. fig. 2; 
Pl. XXXV. fig. 24.) 
[West Singapore, coll. H. N. Ridley ; British Museum. ] 
Description—The corallum is massive, and thickening gradually and smoothly above the 
base for a short distance. The uppermost parts rise into lobes and mounds, which are 
frequently flat-topped and with nearly vertical sides. The base is 6 cm. by 5 cm. 
The calicles are small, 0°75 mm., rather shallow, opening on the flat tops of the humps in 
an open, undifferentiated, reticular ceenenchyma, here flaky, there filamentous. The walls on 
these flat tops are mostly thin, membranous, and ragged; on their vertical sides they are less 
membranous, and more of an irregular ragged lattice-work. The septa in the former case are 
thin, smooth and wavy, so that the intra-calicular skeleton fills the calicle like a loose open 
reticulum with very obscure radial symmetry. On the sides of the humps, the radial 
symmetry appears, but the septa are irregular; they appear round the margin as stalked 
knobs which represent the septal granules, within which is a ring of tall pali. The formula 
appears to be complete, but the arrangements of the ventral triplet are irregular. The central 
tubercle is as large as the lateral pali, to one of which it is frequently joined bya strand. The 
granules are all frosted. 
The section shows the trabecule as the chief constructive elements, They appear to be 
largely lamellate, and to stream towards the surface. The traces of continuous horizontal 
elements are few. The colour is a light brown. 
This coral appears to start very much in the same way as those last described. It bulges 
out everywhere above the base, but the swellings of its sides have a shape of their own, and are 
