REPORT ON THE REEF-CORALS. 73 
elongated. The calicles are quite large at the central portions of the colony, and have a 
diameter of from 5 to 7 mm., some more elongated are about 9 mm. in length and 4 mm. 
wide ; they are free for about 6 or 7 mm., and are quite smooth at their juncture with 
the peritheca. The first and second cycles of septa are subequal and shghtly thickened, 
the other septa are quite small and thin. In the adult form the colony becomes more or 
less cylindrical and rises into stout columnar lobes, in which the calicles are smaller and 
more regular, and the septa more equally thin. 
A fine, young specimen was obtained. A figure, which Milne-Edwards and Haime 
have referred to this species, is given by Ellis, Phil. Trans., lui. pl. xx. fig. 14, 1764. 
Locality.—Mactan Island, Philippines. 
7. Galaxea tenella, Briiggemann. 
Galaxea tenella, Briiggemann, Journ. Mus. Godeffroy, vol. xiv. p. 203. 
This species is very close to the Galawea ellisii, especially to the young forms of that 
species. It appears to be distinguished, however, by its much more prominent costze, its 
more regular calicles, generally much expanded at the margin, and its thinner more 
delicate septa. 
A single young specimen was obtained. 
Locality.—Amboina. 
8. Galaxea fragilis, n. sp. (Pl. 1V. figs. 7-7d). 
Corallum broadly subcylindrical or irregularly convex, with an unequally developed 
but abundant peritheca, the cells of which are very large, loose, and delicate. Calicles 
very delicate and thin throughout, subcircular, oval or slightly elongated and compressed, 
about 4°5 mm. in diameter from margin to margin of the wall, often nearly 7 mm. in the 
long diameter of the elongated calicles, elongato-turbinate, projecting very unequally 
above the peritheca, and from about 5 to 10 mm. high, often about 6 mm. distant from 
each other, but generally closely crowded together, with scattered small calicles developing 
numerously at various parts (apparently where the corallum has been injured). Walls 
very thin throughout ; costes very prominent throughout the free portion of the calicles, 
very thin, those corresponding to the last complete cycle of septa wider than the septa 
to which they correspond, and more prominent than those corresponding to the larger 
septa. Septa of three complete cycles, a fourth very rudimentary, and only seen in a 
few larger calicles ; all the septa are extremely thin and delicate, very exsert, projecting 
about 4 mm., but fragile and generally broken away, except in those calicles that are 
protected from friction ; septa of the first and second cycles equal and projecting quite to 
the centre, those of the third cycle very narrow. 
(ZOOL. CHALL. EXP. —PART XLVI.—1886.) Zz 10 
