A Qeneral History of the Marine Polyzoa. 471 at intervals to clusters of two to five suberect branchlets, and their distal extremities are arcuate, 3 to 3'5 centim. long, and divided into branclilets, which, like the more central ones, arc 2 to 3 centim, long and scarcely 5 millim. thick ; apices 6 to 7 millim. apart. Up|)er surface of the main branches and base of the branclilets provided with numerous large immersed corallitcs, with an aperture of 1 millim. Apical corallites about 2 millim. diameter, usually about 1 millim. exsert. Lateral corallites ascending, elongate, labellate, and imbri-cate, 3 to 4 millim. long and 1*5 millim. thick^ apices more or less pointed. Corallum very porous and reticulate in section, surface densely echinulate; wall thin, finely striato-reticulate and echinulate, except in the case of the younger ones. Star not recognizable in the prominent corallites ; in the immersed ones it consists of six very narrow septa. Two specimens have the apices of some of the branchlets subdivided ; in a third the majority arc proliferous and some of the apical corallites rather over 2 millim. in diameter. Mauritius. LV. — Contributions towards a General History of the Marine Polyzoa, 1880-91. — Appendix. By the Rev. Thomas HiNCKS, B.A., F.R.S. [Continued from p. 176.] * Annals,' July 1881 (p. 55 sep.). Hiantopora ferox, MacGilli vray. In a previous paragraph I have pointed out that this form cannot be referred to Cribrilina, from which genus it has been rightly separated by MacGillivray. Since it was written I have seen Mr. Kirkpatrick's Report on the Polyzoa from Torres Straits collected by Professor Haddou*, in which he ranks Hiantopora ferox as a variety of Membranipora radicijera, Hincks. The connexion between these two very dissimilar species he supposes to be established by the dis-covery of a variety of M. radicifera, to which he has given the name intermedia. Granting that the latter is, as Mr. Kirkpatrick supposes, a variety of M. radicifera, the further development and fusion of its spinous processes may have originated a form bearing a general resemblance to H. ferox. Beyond this, I confess, 1 am not prepared to go. J\lr. Kirkpatrick goes much further ; he assumes that * 'Scientific Proceedings of the Royal Dublin Society,' vol. ri. part 10.
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