192 



THE VOYAGE OF H.M.S. CHALLENGER. 



Height of the corallum in the larger adult specimen, 16 mm. Extreme breadth, 

 1 4 mm. Shorter diameter of the calicle, 8 mm. 



Station 162, in Bass Straits, Australia, 38 to 40 fathoms. Three specimens. 

 Off Port Jackson, New South Wales, 30 to 35 fathoms. One specimen. 



Balanophyllia malaccensis, Saville Kent, Proc. Zool. Soc., 1871, p. 285. 



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

 A single specimen. 



Station 201. Basilan Strait, Philippine Islands. Lat 9° 3' R, long. 121° 48' E. 

 102 fathoms. A young specimen of the same (V). 



Balanophyllia cornu, n. sp. (PI. XII. figs. 11-15). 



Corallum curved, elongate conical, somewhat compressed, without any trace of 

 epitheca, attached by a wide-spreading encrusting base, investing dead fragments of the 

 same species. Costse well marked, close set, broader towards the margin of the calicle 

 and on the surface of the encrusting base, over the entire arc of which they are continued, 

 composed of fine but sharp granules. Wall very finely perforate. Mouth of the calicle 

 oval in outline, somewhat contracted in area by a sbght inflexion of the wall at its mar- 

 gin. Eatio of the axes about 100 to 80. The summits of the two axes about on a level. 

 Fossa narrow, bounded by the vertical inner edges of the major septa, deep in the 

 younger specimens, shallower in very old ones, being filled up by the prominent colu- 

 mella. Columella elongate, spongy, standing up prominently, free from the surrounding 



Diagram showing the arrangement of the septa in Balanophyllia comic 

 The septa of successive orders are indicated by numbers. 



septa at the bottom of the fossa. Septa very slightly exsert, in six systems and four 

 cycles, with some septa of a fifth cycle. Primary and secondary septa nearly equal. 

 The quaternary much larger than the tertiary, and closely accompanying the primary and 

 secondary septa in the upper part of their course, diverging from them in the deeper 

 regions of the fossa. The pairs of quaternary septa embracing each of the primaries are 

 larger and more prominent than those adjoining the secondaries. Septa imperforate, 

 with even surfaces beset with fine pointed granules. 



The accompanying diagram will serve to explain the arrangement of the septa, which 

 is very badly delineated in the figures in the plate. 



