. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. FIcr. -Inocerannis Gauh. Oysters. The two valves of the shell are always altogether unlike in sculpturing, appearance, shape, and size ; and the cast of the interior of the shell is often extremely unlike the form of the outer surface. The type-genus of the family is Hippiirites itself (fig. 199), in which the shell is in the shape of a straight or slightly-twisted horn, sometimes a foot or more in length, constituted by the attached lower val
. The ancient life-history of the earth; a comprehensive outline of the principles and leading facts of palæontological science. Paleontology. FIcr. -Inocerannis Gauh. Oysters. The two valves of the shell are always altogether unlike in sculpturing, appearance, shape, and size ; and the cast of the interior of the shell is often extremely unlike the form of the outer surface. The type-genus of the family is Hippiirites itself (fig. 199), in which the shell is in the shape of a straight or slightly-twisted horn, sometimes a foot or more in length, constituted by the attached lower valve, and closed above by a small lid-like free upper valve. About a hundred species of the family of the Hippuritidcc are known, all of these being Cretaceous, and occurring in Britain (one species only), in Southern Europe, the West Indies, North America, Algeria, and Egypt. Species of this family occur in such numbers in certain compact marbles in the south of Europe, of the age of the Upper Cretaceous (Lower Chalk), as to have given origin to the name of " Hippurite Limestones," applied to these 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
