REPORT ON CORALS— DEEP-SEA MADREPORARIA. J 77 



Madracis. Many of the branchlets in the specimens are broken but, being traversed by 

 flexible supports, remain in situ. In one specimen there are several instances in which 

 a young calicle has been budded directly out of the mouth of an old one in the same 

 direction. 



Extreme height of the largest specimen, which however is much reduced by 

 breakage, 50 mm. Average breadth of the mouths of the calicles, 1-5 mm. Average 

 height of the young calicles, 2 mni. 



Station 177. Off Api Island, New Hebrides. 63 fathoms. Three specimens. 



Bathelia, n. gen. 



Coiallum arborescent, massive ; calicles disposed alternately in nearly straight rows 

 on either sides of the several branches, with very prominent margins. Ccenenchym 

 white, compact, and dense, with its surface covered entirely by curved striae continuous 

 with the costae. Calicles deep and widely open, with four cycles of septa, and a single 

 crown of pali. Columella large, composed of numerous trabecular 



The genus is distinguished from Ocitlina by its single crown of pali, and the dis- 

 tichous arrangement of the calicles; from Sclerohelia (Milne-Edwards and Haime 1 ), it is 

 distinguished by the costal striations, depth, and prominence of the calicles, and number 

 of septa. 



Bathelia Candida, n. sp. (PL VIII. figs. 1-6). 



The corallum is of a pure white; it is arborescent, with a tendency to assume an 

 espalier form. The branches are rounded, and decrease very gradually in size towards 

 the summits. The ccenenchym is hard and dense, its surface is marked all over by 

 curved longitudinal stria? continued from the costae at the margin of each calicle. 

 Calicles. oval in outline, being slightly compressed in a plane at right angles to the length 

 of the branches, with very prominent margins disposed alternately and distichously on 

 the several branches as the result of alternate gemmation. Costae not very prominent, 

 and present only at the very borders of the calicles. Septa slightly exsert, very little 

 prominent from the wall of the calicle interiorly, so that the fossa is deep and widely 

 open. Forty-eight septa present, that is to say, six systems • and four complete cycles, 

 but the primary, secondary, and tertiary septa are nearly equal. Twelve well-marked 

 pali opposite the tertiaries. The fossae of the calicles are somewhat curved downwards 

 towards the bases of the branches, and the septa are slightly curved in correspondence. 

 The septa are thin, and covered on their faces with small pointed granules. Some of the 

 pali are sometimes wanting, and appear sometimes to become lost amongst the trabecular of 

 the columella. The columella is large, composed of numerous vertical branched trabecular. 



1 MM. Milne-Edwards and Haime, Hist. Nat. des Cor., vol. ii. p. 112. 

 (zool. CHALL. EXP. — PART VII. — 1880.) G 23 



