. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 706. €8b3jfe> <**ea*aacwS<£e4. Fig. 708. Fig. 709. Fig. 710. hitherinm Prevostii. 707. Phascolotherium. 708, Figs 706-710.— Jurassic Mammals: 706. Amphitherinm Prevostii. 70 Amphitherium. 709. Triconodon. 710. Plagiaul from a lower horizon (Stonefield states). If we add to these again four- teen genera (twenty-five species), recently described by Marsh, from the American Jurassic, we have at least thirty-three Jurassic genera known. Besides these, at least five genera are found in the Upper Tria
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 706. €8b3jfe> <**ea*aacwS<£e4. Fig. 708. Fig. 709. Fig. 710. hitherinm Prevostii. 707. Phascolotherium. 708, Figs 706-710.— Jurassic Mammals: 706. Amphitherinm Prevostii. 70 Amphitherium. 709. Triconodon. 710. Plagiaul from a lower horizon (Stonefield states). If we add to these again four- teen genera (twenty-five species), recently described by Marsh, from the American Jurassic, we have at least thirty-three Jurassic genera known. Besides these, at least five genera are found in the Upper Trias of all countries, and sixteen genera (twenty-four species), recently (1889) described by Marsh, from Upper Cretaceous (Laramie). We may say, therefore, that there are now known at least fifty-four genera of Meso- zoic mammals. The number of species is, of course, much greater. Affinities of Jurassic Mammals.—The Jurassic, and indeed the Meso- zoic mammals, as contrasted with mammals of later times, may be characterized in a general way as small insectivorous marsupials, or, perhaps better, as a type connecting insectivores and marsupials, and therefore lower and more generalized than either. They were, espe-. 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
