. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. 128 HISTORICAL PALEONTOLOGY. such as the huge and thick-shelled Megalomi of the American Wenlock formation, the Bivalves {Lamellibranchiata) present. 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. Edinburgh, London, Blackwood

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Keywords: ., bookaut, bookcentury1800, bookdecade1870, booksubjectpaleontology