140 MADREPORARIA. 
130. Porites Great Barrier Reef (gn37. (P. Queenslandic septima et tricesima.) 
(Pl. XVIII. fig. 4; Pl. XXI. fig. 26.) 
[Gulf of Carpentaria, Great Barrier Reef, coll. W. Saville-Kent; British Museum. ] 
Description.—The corallum rises into a tall, stout, erect plate, of varying thickness from 
1-3 cm. thick, the variations being due to the waviness of its sides. It widens as it rises, being 
7 cm. across when 11 em. high. Rounded and constricted knobs spring from its top and 
lateral edges, the knobs being compressed in planes parallel to the plane of the plate. The 
living layer extends at least 11 em. 
The calicles are all flush with the surface, varying greatly in size, but mostly under 1 mm. 
The walls appear rather thick, but can mostly be analysed into a very pronounced zigzag 
thread, the points running into the calicle as short portions of septa. The zigzag may be so 
pronounced that the septa appear almost to striate the wall transversely, and the wall looks 
frequently incomplete, adjacent interseptal loculi communicating between these transverse septal 
ridges. Beneath the surface the walls appear flaky. The septa show a ring of septal granules 
frequently hardly separated from the walls, and a ring of not very conspicuous pali; the 
five principal pali are constant, but almost every possible variation occurs in the appearances 
of the elements of the triplet. The columellar tubercle is thin and flattened. These elements 
do not fill the calicle aperture, and the dark spaces between them make the calicles conspicuous. 
The section shows the trabecule as thin and regular, and about their own width apart. 
The colour of the unbleached coral is an ash-grey, which penetrates 2 mm. 
There is only one specimen of this coral, which should have been placed among the forms 
from the Torres Strait. It is placed here in association with forms Nos, 35 and 36 on account 
of its method of growth. Although I do not mean to imply that these latter forms came from 
the same place or are in any way related, still it is interesting from a comparative point of view 
to emphasise these departures from the more common explanate, massive and branching forms. 
The specimen has a faint superficial resemblance to a frequent form assumed by Heliopora. 
a, Zool. Dept. 92. 12. 1. 534. 
151. Porites Great Barrier Reef (4938. (P. Queenslandi octava et tricesima.) 
(Pl. XVILLE fig. 5); PIE XXT. fig. 27.) 
[Great Barrier Reef, coll. W. Saville-Kent; British Museum. ] 
Description.—The form of the corallum is unknown. The single specimen is a tongue- 
shaped fragment, nearly 5 cm. long, 2'5 cm. in diameter, and tapering to a flattened tip 
1°5 cm. broad and 0°5 em. thick, the tip being rounded off. 
The calicles are polygonal, conspicuous, and deepened, about 1 mm. in diameter. The 
walls are simple, straight, and appear, from above, like rows of granules which are the tips of 
