. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 32 Prof. H. A. Nicliolson on the strafing the presence of the component spicules in any thin section of the skeleton of CoralUum that I have prepared. The annexed sketch of part of a longitudinal section of a branch of CoraUium will show that the skeleton is made up of spicules of the ordinary type of these structures amongst the Alcyonarians, the outline of the spicules being sometimes indistinct, and the interspaces between them being occupied by a peculiar crystalline tissu
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 32 Prof. H. A. Nicliolson on the strafing the presence of the component spicules in any thin section of the skeleton of CoralUum that I have prepared. The annexed sketch of part of a longitudinal section of a branch of CoraUium will show that the skeleton is made up of spicules of the ordinary type of these structures amongst the Alcyonarians, the outline of the spicules being sometimes indistinct, and the interspaces between them being occupied by a peculiar crystalline tissue. Essentially similar pheno- mena are seen in transverse sections of the skeleton of Coral- Uum. I may add that I have also always found it possible to recognize the presence of the component spicules of the corallum even in the genus Isis, though the fusion of the spicules is here much more complete than it is in CoralUum. In fact, the spicules in CoralUum, are not, strictly speaking, *' fused," any more than they are in Tuhipora. Fiff. Part of a longitudinal section of CoraUium ruhrum, magnified 180 times, showing- tbe spicules of the skeleton united by a crystalline or fibrous matrix, produced by the calcification of the soft interspicular tissues. In the second place, Mr. Hickson has made a series of very interesting investigations as to the endothecal structures of Tubipora, in which he shows that there is a much closer apparent resemblance between the axial tube of this genus and the infundibuliform tabulae of Syringopora than I had been led to believe was the case by examining the specimens of the former genus at my disposal. lie also shows that flat tabula3, sometimes complete and sometimes incomplete, are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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