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Lawrence, near Beauharnois and elsewhere, many fossil footprints have been observed on the surface of the rippled layers. They are supposed by Professor Owen to be the trails of more than one species of articulate animal, probably allied to the King Crab, or Limulus.
He did not like it; he could not account for it; and he determined to stop it. Never since the days of his Limulus ancestry had any of his ascendants thought thus. Their modes of thought might be many, but their thought was one.
Adams would have liked to begin afresh with the Limulus and Lepidosteus in the waters of Braintree, side by side with Adamses and Quincys and Harvard College, all unchanged and unchangeable since archaic time; but what purpose would it serve? A seeker of truth or illusion would be none the less restless, though a shark!
One is the Limulus or "king-crab," which seems to be a descendant, or near relative, of the Trilobite, and has survived until modern times. Others announce the coming of the long-tailed Crustacea, of the lobster and shrimp type. They had primitive representatives in the earlier periods, but seem to have been overshadowed by the Trilobites and Eurypterids.
In Siluria, he understood, Sir Roderick Murchison called the horseshoe a Limulus , which helped nothing. Neither in the Limulus nor in the Terebratula , nor in the Cestracion Philippi ,any more than in the Pteraspis, could one conceive an ancestor, but, if one must, the choice mattered little. Cousinship had limits but no one knew enough to fix them.
He had begun brilliantly, you may remember, by a little paper on Limulus Polyphemus that attracted a good deal of notice when it appeared in the Central Blatt; but gradually his zoological ardour yielded to an absorbing passion for the violin, which was followed by a sudden plunge into physics.
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