48 MADREPORARIA. 
The calicles average 1:25 mm. in diameter; they are round, and, except in the wrinkles 
between the nodular excrescences, sunk in the pits formed by the ccenenchymatous develop- 
ment of the walls. These latter foam up into thick round-topped swellings, which vary in 
aspect according to the thickness of the skeletal elements. The septal formula is complete, 
and the pali may be conspicuously developed; wall-granules are suggested on the steep sides 
of the ccenenchymatous margins of the calicles; but no ring of septal granules appears round 
the pali. The fossa is large; in its base can be seen a large columellar tubercle, which not 
unfrequently rises from a bar of the columellar tangle running in the plane of symmetry. 
There are three specimens, all showing the same method of growth, with calicles of the 
same size and type. The aspects of the three are quite different, a fact which led Mr. Quelch 
to consider them to represent two distinct species. When, however, we add to the resemblances 
just mentioned in the calicles the fact that all three of them show the same kind of ccenen- 
chymatous specialisation of the wall, bearing in mind that that specialisation is somewhat rare 
among the Poritide, we are naturally led to examine the differences very closely. These may, 
it seems to me, be due entirely to variations in the thickness of the skeletal elements. 
Specimen a (the type of Mr. Quelch’s “crassistellata”) from Kandayu (1. c. Pl. XI. 
figs. 4, 4a). 
The skeleton is thick, frosted, and crystalline. The ccenenchymatous swellings of the 
walls are not uniformly developed over the whole of the surface of the nodules, but make rings 
round single calicles and gyrating ridges. Young calicles open upon their swollen tops. 
Looked at under a pocket-lens, the swellings appear like dense piles of large glassy granules. 
The septa are broad and wedge-shaped, and the narrow slit-like interseptal loculi run back as 
deep gashes into the dense ccenenchymatous swellings. The ring of eight pali (fig. 3, B, 
p. 19) is very conspicuous. At the edges of the colony the swellings become more reticular, 
but the reticulum is flaky and the septa wedge-shaped flakes with toothed edges. 
a. Zool, Dept. 86. 12. 9. 315. 
Specimen 6, from Wakaya reefs. 
The ccenenchymatous swellings of the walls are here also irregular in size and dis- 
tribution. The reticulum of the swellings is only slightly less dense, but that of the 
intra-calicular skeleton is not especially thickened, so that the septal formula is clear and con- 
spicuous, and the interseptal loculi open and petaloid ; the pali, and, at a lower level, the central 
tubercle, are conspicuous, but not frosted. In the valleys between the nodular uprisings of 
the surface the walls may be a simple irregular lattice, while in specimen a the walls are every- 
where, even on the under surface, thick, and as if composed of solid flakes. Tabule are very 
numerous. 
b. A small fragment. Zool. Dept. 1905. 1. 19. 5. 
Specimen ¢ (the type of Mr. Quelch’s “crassa”) from the “ Reefs, Fiji” (1. ¢. Pl. XI. 
figs. 2, 2a). 
The ccenenchymatous swellings are more evenly distributed over the whole surface, their 
