. Animals before man in North America; their lives and times. Paleontology. Animals Before Man even were perhaps not developed, and protect- ive mimicry probably played but small part * in the struggle for existence; the law of the world was might, and the weaker went to the wall. As the smaller fishes of the Devonian period died out, sharks and their relatives, which first. The sleeper shark, Somniosus microcephalus, a large but harm- less species. appeared in Silurian times, came upon the scene in numbers; not sharks as we now know them, but smaller and simpler forms, which were later on rep
. Animals before man in North America; their lives and times. Paleontology. Animals Before Man even were perhaps not developed, and protect- ive mimicry probably played but small part * in the struggle for existence; the law of the world was might, and the weaker went to the wall. As the smaller fishes of the Devonian period died out, sharks and their relatives, which first. The sleeper shark, Somniosus microcephalus, a large but harm- less species. appeared in Silurian times, came upon the scene in numbers; not sharks as we now know them, but smaller and simpler forms, which were later on replaced by others more like those of to-day. We are very apt to think of sharks as great and formidable monsters ready to tear * It is perhaps hardly necessary to warn the reader that this is pure theory, although it has much of probability back of it, for protective resemblances could hardly have originated by any other process than that of a slow weeding out of the more conspicuous individuals. 104. 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, D. Appleton and company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectpaleont, bookyear1902
