176 MADREPORARIA. 
surface granules branch and meet to form a surface filamentous reticulum. The septa take 
their characters from those of the walls into which they run; their lateral edges are always 
finely echinulate. The pali are most conspicuously developed down the pendent sides, where 
they appear like the other trabecular granules and in a ring of six (Diagram O, fig. 3, p. 19). 
On the top surface, where the radial symmetry is obscured in the open loose reticulum, the 
pali are only just traceable. The fossa is deep, irregular on the top surface, but neat and 
round down the sides. Traces of a columellar tubercle can be seen. 
The vertical section shows long thin trabecule, not as straight rods but rather as wavy 
threads, often slightly lamellate, streaming towards the surface; the horizontal elements are 
quite irregular. 
The colour is a cold light fawn. 
This Porites is quite unique in the collection. It recalls the two Red Sea forms called by 
Dr. Klunzinger Synarea wndulata et lutea. On the genus Synarea see Introduction, p. 9. 
The specimen seems to be a piece out of a flat cake 2 cm. thick. Underneath, it has an 
epitheca, as if it had been detached from the surface to which it adhered, and two of its sides 
seem to have been broken away on some previous occasion and to have been covered over by 
the bending down of the living surface almost at right angles. 
a. Zool. Dept. 89. 9. 24. 81. 
176. Porites China Sea 1913. (P. Sinensis tertiadecima.) 
(Pl. XXVII. fig. 3; Pl. XXXV. fig. 11.) 
[Tizard Bank, 6-7 fathoms, coll. Bassett-Smith ; British Museum. | 
Syn. Porites crassa Bassett-Smith (non Quelch), Ann. and Mag. Nat. Hist. 6°, vi. (1890) p. 456. 
Description.—The corallum is explanate, with warty surface expanding freely into large 
slightly concave dishes attached by their centres, or else building up with other organisms thick 
crusts, the coral creeping in patches over the irregular surface. The edges are rounded and 
thick, though sometimes with a stout chalky epitheca projecting. The stock may reach the 
thickness of 8-10 mm. 
The calicles are conspicuous and open, sharply sunk, 1*2 mm. in diameter. The walls 
are coarsely reticular, and tend to surge up between the calicles in rather full-rounded ridges. 
These upsurgings occur in groups, which cause small patches of the surface to rise up into 
rough rounded warts which start suddenly from the surface. In texture, the rounded wall- 
ridges are coarse and very thick (? flaky) but covered with a layer of finer filamentous 
reticulum. The walls are thinner in the smooth level valleys between the warts. 
The septa are thick, coarse, and with very uneven sides, leaving only short, narrow, 
irregular but deep slits as interseptal loculi. They only project deep down and send up tall 
rod-like pali which end in frosted granules, usually as four large lateral principals and two 
smaller directives. A columellar tangle with a central tubercle can be seen a little way down 
the fossa. 
