. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palaeontological science. Paleontology. THE PERMIAN PERIOD. 199 feebly represented at the present day, is one which attained its maximum development in the Mesozoic period. The Univalves iyGasteropodd) are rare, and do not demand special notice. It may be ob- served, however, that the Palaeo- zoic genera EiLomphahis^ Mur- ch'i'sonia, Loxonema^ and Mdcro- cheilus are still in existence, to- gether with the persistent genus Fleurotomaria. Fteropods of the old genera Theca and Coniila- ria have
. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palaeontological science. Paleontology. THE PERMIAN PERIOD. 199 feebly represented at the present day, is one which attained its maximum development in the Mesozoic period. The Univalves iyGasteropodd) are rare, and do not demand special notice. It may be ob- served, however, that the Palaeo- zoic genera EiLomphahis^ Mur- ch'i'sonia, Loxonema^ and Mdcro- cheilus are still in existence, to- gether with the persistent genus Fleurotomaria. Fteropods of the old genera Theca and Coniila- ria have been discovered; but the first of these characteristi- cally Palaeozoic types finally dies out here, and the second only survives but a short time longer. Lastly, a few Cephalopods have been found, still wholly referable to the Tetrabranchiate group, and belonging to the old genera Orthoceras and Cyrtoceras and the long-lived Nautilus. Amongst Vertebrates^ we meet in the Permian period not only with the remains of Fishes and Amphibians, but also, for the first time, with true Reptiles. The Fishes are mainly Ganoids^ though there are also -emains of a few Cestraciont. Fig. 136.—A7xa antiqua. 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 Nicholson, Henry Alleyne, 1844-1899. New York, A. L. Fowle
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Keywords: ., bookcentur, bookdecade1870, booksubjectpaleontology, bookyear1876
