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This coral comes near Balanophyllia gigas (Bruggeman, unpublished MSS.), from 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. BalanoplujUia 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 

 24 mm. Extreme height of the smaller specimen, 25 mm. 



Station 192, off the Ki Islands. Lat, 5° 42' S., long. 132° 25' E. 129 fathoms. 

 Three specimens dredged 



Balanophyllia, sp. (?) 



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 costse, 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. 



Balanophyllia 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 

 costse well marked but slightly prominent sharp ridges, beset with two or three slight 

 dentations ; secondary costse much finer, with three or four denti dilations ; other costse 

 scarcely visible (fig. 106). 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 costse 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 



