. The chain of life in geological time [microform] : a sketch of the origin and succession of animals and plants. Paleontology; Paleobotany; Paléontologie; Paléobotanique. Fig. 59.âSpiri/ermucronatus(). Devonian. appearance during the Palceozoic periods, and since they have been decreasing in number to the present period. We wil leave out of question the species, for they vary so little that it is often very difficult to trace really good distinctive characters between them; it is different with the genera, as they are, or. Tig. 59^.âAthyris subtilita(\{6\\). Carboniferous. u, â¢â Ext
. The chain of life in geological time [microform] : a sketch of the origin and succession of animals and plants. Paleontology; Paleobotany; Paléontologie; Paléobotanique. Fig. 59.âSpiri/ermucronatus(). Devonian. appearance during the Palceozoic periods, and since they have been decreasing in number to the present period. We wil leave out of question the species, for they vary so little that it is often very difficult to trace really good distinctive characters between them; it is different with the genera, as they are, or. Tig. 59^.âAthyris subtilita(\{6\\). Carboniferous. u, â¢â Exteriors, c, Interior, showing spirals. should be, founded on much greater and more permanent dis- tinctions. Thus, for example, the family Spiriferiim "nchules genera w^ich are all charar^'^.rised by a calcified spiral lamina for the support of the brachial appendages; and, however varied these may be, they always retain the distinctive characters of the group from th r first appearance to their extinction. The F 2. 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 Dawson, J. W. (John William), Sir, 1820-1899. London : Religious Tract Society
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleontology, bookyea
