“(ee THE VOYAGE OF H.M.S. CHALLENGER. 
5. Galaxea aspera, n. sp. (PI. IV. figs. 5—5d). 
Corallum broadly convex above, subcylindrical, with a very scant peritheca, the cells 
of which are small and closely placed. Calicles either subcircular and about 6 mm. in 
diameter at the margin of the wall, or oval, elongated and compressed, and about 9 mm. 
in the long diameter; elongato-turbinate, but many calicles at different parts of the 
corallum, and chiefly at the outer margin, very shortly and distinctly turbinate ; raised 
above the peritheca for a large portion of their length, many being free for more than 2 
em., irregularly crowded, generally about 4 to 5 mm. apart, but often very closely placed 
owing to the development of many small calicles around some of the larger ones (apparently 
owing to injury). Walls neatly thin; costee very prominent throughout the length of 
the free portion of the calicles, distinctly raised but less prominent in the substance of the 
peritheca, slightly thickened and sharp, those corresponding to the small septa more 
prominent than those of the larger, less raised at the basal part of the shortly turbinate 
calicles than at the upper portion. Septa of three complete cycles, a fourth being rudi- 
mentary in many of the larger cups, very exsert, projecting about 5 mm., sub-acute 
above and somewhat fragile, being easily broken away; those of the first and second 
cycles nearly equal, thickened slightly at the wall and reaching to the centre; those 
of the third cycle projecting nearly to the centre and quite thin. 
This species, like the Galaxea fragilis, possesses broad and prominent cost, but it 
differs from that form in being much rougher and less delicate throughout, in its larger 
calicles, in the size and arrangement of the septa and coste, and in the nature of the 
peritheca. 
In the great prominence of its septa it recalls Galaxea fascicularis, Galaxea hystrix, 
and Galaxea cuspidata. The Galaxea fuscicularis may be distinguished by the denser 
and firmer texture, by the thick walls and septa, which are often very granulated, and 
by the slightly prominent costee which are obsolete on the basal part of the calicle where 
the wall becomes smooth. Galawea cuspidata is well distinguished by its extremely 
large and regularly turbinate calicles with very thick septa. Galazxea hystrix is distin- 
guished by the thick and abundant peritheca, by the cylindrical non-turbinate calicles, 
which are remotely carinate exteriorly, the wall being nearly smooth except at the upper 
portion. 
Locality.—Amboina. 
6. Galaxea ellisii, Milne-Edwards and Haime. 
Galaxea ellisi, Milne-Edwards and Haime, Cor., ii. p. 228. 
The appearance of this species varies much with age. In the young state its colonies 
are broadly convex, with closely placed calicles, which are subcireular, oblong or much 
