AUSTRALIAN PORITES. 119 
GREAT BARRIER REEF—GREEN ISLAND. 
106. Porites Great Barrier Reef 49)13. (P. Queenslandic tertiadecima.) 
(PL XV. fig. 3; Pl. XXI. fig. 5.) 
[Green Island,* coll. W. Saville-Kent; British Museum. | 
Description.—The corallum is massive (?globular), [There is only a small sector with 
smooth triangular surfaces split along the trabeculw, showing that the coral must have been 
thick.] The surface was smooth, but slightly wavy. 
The calicles are small, under 1 mm., crowded and angular. The walls are simple, straight, 
sometimes incomplete; they are jagged and irregularly granular, rather than zigzag. The 
septa start just below the edge of the walls, which thus appear slightly raised; they are very 
rough, like the walls; they are thickened by synapticule round the periphery, sometimes 
making an inner wall ring. In the more regular calicles the pali form a complete ring of 
small roughened granules, rather deep down and inconspicuous. They rise from a skeletal 
ring, and are joined symmetrically with a small central tubercle still deeper down, so that 
one bar of the regular columellar tangle runs in the directive plane, and may result in the 
trident formation shown in Diagram G, fig. 3. Groups of calicles occur in which these 
regular features are quite lost. 
In the vertical section the light brown colouring matter of the living colony extends 
4-5 mm. deep. The trabecule are stout, almost ribbon-like, and separated by narrow rows 
of pores, 
I have so far found no Porites which compares well with this. 
a, Zool. Dept. 92. 12. 1. 343. 
GREAT BARRIER REEF—ROCKY ISLAND. 
107. Porites Great Barrier Reef (4914. (P. Queenslandie quartadecima.) 
(Pl. XV. fig. 4; Pl. XXL. figs. 6, 7.) 
[Rocky Island, coll. W. Saville-Kent ; British Museum] 
Description.—The corallum is massive, with smooth rounded surface, and living layer 
closely adherent at the edges, which bend under. [The specimen is a small, long oval ridge, 
* This island is ten to twelve miles east of Cairns. See ‘The Great Barrier Reef,’ p. 112. 
