REPORT ON CORALS—DEEP-SEA MADREPORARIA. 193 
All three specimens obtained are attached to fragments of dead coralla of the same 
species. ‘Two of the specimens, as seen in the figure, are attached together to the wall of 
a dead larger calicle, their spreading bases are partly confluent at their edges, but the 
line of demarcation between the two is defined to some extent by the arrangement upon 
them of the costal striations. 
This coral comes near Balanophyllia gigas (Briiggeman, unpublished MSS.), from 
Japan, the type of which species is in the British Museum, and which has a similar pro- 
minent columella. In Balanophyllia gigas there is, however, a dense epitheca, which 
is entirely wanting in the present species. Balanophyllia gigas is much larger than 
Balanophyllia socialis, but has the same general shape. 
Extreme height of the largest specimen, 55 mm. Longest diameter of the calicle 
24mm. Extreme height of the smaller specimen, 25 mm. 
Station 192, off the Ki Islands. Lat. 5° 42’S8., long. 132° 25’ E. 129 fathoms. 
Three specimens dredged 
Balanophyllia, sp. (2) 
A single broken specimen of a Balanophyllia, with the interior of the calicle entirely 
hollowed out by decay, was dredged off the Philippines. It is curved, with an irregularly 
undulate surface, compressed, and attached by a very narrow pedicle. It has well marked 
and very regular costa, and no trace of epitheca. I cannot refer it to a species, but pos- 
sibly it is a variety of Balanophyllia socialis. 
Height of the calicle, 35 mm. 
Station 208, off Gigantes Island, Philippines. 18 fathoms. 
Balanophylhia rediviva, n. sp. (Pl. XV. figs. 10-12). 
Corallum reddish coloured, usually elongate, curved, cylindrical, the upper portion 
only living, the lower dead and partly decayed, sometimes short and cup-shaped. When 
elongate, marked by a series of transverse constrictions, marking where rejuvenescence 
has taken place. Wall finely perforate all over. Composed of fine granules. Primary 
costee well marked but slightly prominent sharp ridges, beset with two or three slight 
dentations ; secondary costee much finer, with three or four denticulations ; other coste 
scarcely visible (fig. 10). A thin, smooth, glistening epitheca present at the base of the 
living portion of the corallum. Around the mouth of the old calicle, from which the new 
growth of the corallum has started, the dentations of the costa and tips of the exsert 
septa remain visible through the epitheca slightly prominent. Calicle oval, or nearly 
circular in outline. Septa in six systems and four cycles. Primary and secondary septa 
prominently exsert according to order, quaternary septa much more exsert than the ter- 
tiaries, sometimes more so than the secondaries, and with their exsert portions fused to 
the sides of the primaries, against which they lie. The septa consisting of fine imperforate 
(ZOOL. CHALL, EXP,—PART VII.—1880.) G 25 
