REPORT ON THE REEF-CORALS. 89 
the slight endotheca, the interseptal spaces are very deep and conspicuous around the 
porous mass of the columella. 
Locality. —Banda. 
2. Ulophyllia cellulosa, n. sp. (Pl. III. figs. 6-6c). 
Corallum convex above, flattened below, destitute of an epitheca, strongly and 
denticulately costate, with the intercostal spaces very abundantly and largely vesicular. 
Calicles sometimes placed singly, but generally arranged in long sinuous valleys in which 
the centres are very distinct, and always separated by the meeting of two large septa 
from opposite sides of the valley. Width of the valleys from 15 to 30 mm., depth often 
as much as 20 mm. Walls very thin, often broken through, much more raised at the 
central than at the outer part of the corallum where the cups are broad and shallow. 
Septa unequal, of four cycles, thin, very prominent below, and forming a distinct, central 
depression for the columella; much less prominent above and giving the ridges an acute 
edge, unevenly and rather far apart, being about six or eight to the centimetre on the 
top of the ridges, much more numerous and unequal in the outer and shallower cups, 
where there are often as many as thirteen to the centimetre; teeth of the septa rather 
large below, becoming very small or absent above, never becoming long and narrow, or 
bifuréating; a paliform lobe generally marked. Columella generally well developed, 
forming a rather large porous or trabeculate mass, but frequently scanty. Endotheca 
very abundantly developed as large, long, regularly placed, interseptal vesicles, which 
give a very swollen, convex appearance to the ridges at their lower portion and for some 
distance above the position of the columella, equal to about half the height of the ridges, 
the wall being continued above this swollen portion as a narrow lamina. 
In appearance the single specimen in the collection has a general resemblance to 
the figure of Madrepora lactuca, Esper.! This species is easily separated from the 
Ulophyllia aspera by the abundantly developed endotheca which here gives rise to a 
swollen, raised ridge between the valleys in which the centres are placed. This ridge, 
formed by the large dissepiments between the septa, is more clearly seen when the 
prominent septa are broken away. A transverse section of the ridge to the level of the 
columella shows the thin wall with opposite septa, on the lateral surfaces of which are the 
thin interseptal dissepiments, which form long, curved chambers, and which extend above 
the columella for about one-half the height of the ridge. Other characters which serve to 
separate it from the same species are the much thinner walls ; the wider, deeper, and more 
continuous valleys in which the centres are placed ; their regularly and less sharply toothed 
septa; the more scanty columella ; and the absence of a distinct epitheca on the vesicular 
costa. 
Locality. —Banda. 
1 Pflanz., Madrep., Tab. xxxa. 
(ZOOL. CHALL. EXP.—PART XLVI.—1886.) Zz 12 
