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Published online by Cambridge University Press: 01 May 2009
Gen. Char.—Corallum composite, with an epithecate base, the corallites subpolygonal, and indissolubly united by the coalescence of their walls. The corallites are sometimes circumscribed, but they are for the most part more or less extensively connected by deficiency of their walls in particular directions, so as to give rise to sinuous rows of serially-united tubes. The calices, like the corallites, may be circumscribed, but are mostly in the form of vermiculate grooves sorresponding with the serially confluent corallites. The calices ire not oblique, nor are the corallites reclined. Mural pores are numerous and well developed. Septa and septal spines are wholly wanting. The tabulaæ are numerous, being simple and complete in the circumscribed corallites, but becoming vesicular in the rows of serially confluent corallites. New corallites are produced by fission.
page 291 note 1 Mr. James Thomson has described mural pores as occurring in Chaætetes Etheridgit, Thoms, sp., C. septosus, Flem., C. depressus, Flem., and C. hyperboreus, Nich. and Eth., jun.; and he has therefore referred these species to Alveolites (Proc. Phil. Soc. Glasg. 1881). I have, however, examined numerous specimens and Microscopic sections of all these species, and am quite satisfied that the walls of the corallites are in all of them imperforate. Indeed, the figures given by Mr. Thomson himself show conclusively that the structures which he has described as mural pores could not possibly be of this nature.Google Scholar