138 MADREPORARIA. 
The single specimen may, perhaps, be another of the group here described under Nos. 28 
and 29. The growth-form may, perhaps, agree, but the calicles differ, as may be seen from a 
comparison of the figures Pl. XVII. figs. 2-5 with fig. 9. There is not much trace of the 
tendency to form a filamentous top to the wall, for, as stated, there is mostly a median ridge. 
a. Zool. Dept. 92. 12. 1. 516, 
127. Porites Great Barrier Reef (4934. (P. Queenslandia@ quarta et tricesima.) 
(BLSXSVAL tes) 
[Great Barrier Reef, coll. W. Saville-Kent; British Museum. ] 
Description —The corallum is a smooth, nearly perfectly oval mass, attached by a small 
oval base. The adherent edge bends smoothly under all round as far as the base. There is no 
evidence of there having been any stalk formation. 
The calicles are rather large, 1°5 mm., conspicuous because deep, and very sharply 
angular ; the walls are simple, straight, fenestrated, and with granular rather than denticulate 
edges. The septa are stout and with very granulated sides, so as nearly to fill the base of the 
ealicle. They appear as irregular thickenings of the walls round the aperture, and these give 
the wall-edges the peculiar ragged appearance well shown in the figure. They only project 
deep down in the fossa, The ring of pali which rises from them is large and tall, reaching 
almost to the height of the wall. They are in a complete number. The central tubercle is 
thin and flattened in the directive plane; it rises nearly as high as the pali. 
The colour of the unbleached coral is a rich reddish brown. The section of the base shows 
# regular arrangement of radiating trabecule, stout and closely packed. 
There is only one specimen of this Porites, which appears to be quite unique in the 
character of its walls. 
a. Zool. Dept. 92. 12. 1. 515, 
128. Porites Great Barrier Reef (4935. (P. Qucenslandia quinta et tricesima.) 
(PL. XVII. fig. 2); Pl. XX. fig. 24.) 
[Great Barrier Reef, coll. W. Saville-Kent ; British Museum. ] 
Description —The corallum towers up into stout tapering columns of very uregular 
transverse outline, the sides being knobbed or with vertical ridges some 1-1°5 em. high on a 
column 5-6 cm. in thickness. The living layer is at least 9 cm. deep, and the lower edges 
creeping but not always closely adherent. 
The calicles are everywhere superficial, so that the surface is smooth; they vary in size, 
averaging 1 mm., with a good many double calicles. The walls are simple, very thin, zigzag, 
