. Animals of the past; an account of some of the creatures of the ancient world. Paleontology. THE EARLIEST KNOWN VERTEBRATES 21 they declined in numbers even during the Carbonifer- ous Period, and later dwindled almost to extinction. And while sharks again increased, they never reached their former abundance, and the species that arose were swift, predatory forms, better fitted for the struggle for existence. REFERENCES The early fishes make but little show in a museum, both on account of their small size and the conditions under which they have been preserved. The American Museum of Natural
. Animals of the past; an account of some of the creatures of the ancient world. Paleontology. THE EARLIEST KNOWN VERTEBRATES 21 they declined in numbers even during the Carbonifer- ous Period, and later dwindled almost to extinction. And while sharks again increased, they never reached their former abundance, and the species that arose were swift, predatory forms, better fitted for the struggle for existence. REFERENCES The early fishes make but little show in a museum, both on account of their small size and the conditions under which they have been preserved. The American Museum of Natural History has a fine exhibition series of these old fishes; the Mu- seum of Comparative Zoology has a large collection of them and there is a considerable number of fine teeth and spines of Carbonif- erous sharks in the United States National Museum. Hugh Miller's uThe Old Red Sandstone" contains some charming descriptions of his discoveries of Pterichthys and re- lated forms, and this book will ever remain a Pterichthys the Wing Fish. 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 Lucas, Frederic A. (Frederic Augustus), 1852-1929. New York
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaleont, bookyear1922
