. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 318 Mr. J. Thomson on a creation of a new genus for its reception was suggested. This, however, seems to be unnecessary. Subsequent in- vestigations have revealed that reproduction in this and the accompanying genus LitJiostrotion, Luidius, may be either by calicular gemmation or by fissiparity. Indeed, I hope by-and-by to demonstrate that we cannot restrict generic identity, not only in this but also in several other genera, by the mode of development. While the union of the
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 318 Mr. J. Thomson on a creation of a new genus for its reception was suggested. This, however, seems to be unnecessary. Subsequent in- vestigations have revealed that reproduction in this and the accompanying genus LitJiostrotion, Luidius, may be either by calicular gemmation or by fissiparity. Indeed, I hope by-and-by to demonstrate that we cannot restrict generic identity, not only in this but also in several other genera, by the mode of development. While the union of the corallites and consequent prismatic aspect is new to the genus, yet we cannot overlook the fact that our knowledge of the Carbon- iferous fauna is fragmentary and imperfect; but when moi'e complete other forms will no doubt be discovered showing even a closer relation to its nearest ally Lithostrotion. A similar objection to the union of the cylindrical and pris- matic varieties in the genus Lithostrotion was long accepted ; but the generalization of those great masters Mihie-Edwards and Jules Haime showed that external aspects so dissimilar were not incompatible with generic identity, and that we can define genera oidy from the internal structural characters—a decision which, from the enormous amount of evidence in my hands, I cordially endorse. All the other structural details being similar to those characteristic of the other species of the genus, we are justified in believing that the creation of a new genus on the union of the corallites would be adding an unwarranted synonym to the list of Carboniferous corals. Diphyphyllum Argyllii^ sp. no v. Fi-. 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
Size: 1954px × 1278px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
