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Updated: June 1, 2025
"That there," she glibly rattled off, "is the organic remains of a three-toed woolly bronsolumphicus of the carboniferous limestone, or Upper Silurian trilobite period. I believe I have the name correct. It was dug up out of a dry lake in Wyoming that years ago got to be mere loblolly, so that this unfortunate critter bogged down in it.
Billings was enabled, by means of a specimen found in Canada, to prove that the trilobite was provided with eight legs. Palaeaster asperimus, Salt. Echinosphaeronites balticus, Eichwald. Mouth. b. Point of attachment of stem.
Then bread and butter and salad were found to be very refreshing. But while Daisy eat, she looked at the trilobite. "Please tell me what it is, Capt, Drummond." "It is a Crustacean." "But you know I don't know what a Crustacean is." "A Crustacean, is a fellow who wears his bones on the outside." "Capt. Drummond! What do you mean?" "Well I mean that, Daisy.
Daisy was more eager than he; she wanted very much to have a trilobite for her own keeping; the difficulty was, she did not know how to look for it. All she could do was to follow her friend and watch all his doings and direct him to new spots in the mountain that he had not tried.
"Very well," said he quietly, "it is the shell of a crustacean, of an extinct species called a trilobite. Nothing more." "But don't you conclude ?" "Just what you conclude yourself. Yes; I do, perfectly. We have left the granite and the lava. It is possible that I may be mistaken. But I cannot be sure of that until I have reached the very end of this gallery."
"No; there were other sea creatures of the lower kind, and at last fishes. But when the fishes became very numerous, the trilobites died out and passed away." That old time had a wonderful charm for Daisy; it was, as she thought, better than a fairy tale. The doctor at last let her into the secret that he had a trilobite too; and the next time he came he brought it with him.
The eye varies greatly in the number of its lenses, ranging from fourteen in some species to fifteen thousand in others. During the long ages of the Cambrian the trilobite varied greatly. Again and again new species and genera appeared, while the older types became extinct. For this reason and because of their abundance, trilobites are used in the classification of the Cambrian system.
In all these countries there is an equally marked difference between the Cambrian fossils and those of the Upper and Lower Silurian rocks. The trilobite with the largest number of rings, Erinnys venulosa, occurs here in conjunction with Agnostus and Microdiscus, the genera with the smallest number.
The remarkable thing about this, however, is that previous to the "Primordial," while it was becoming a trilobite, it must have had a singularly flexible organization, otherwise it could not have obtained its complex structure; but when it reached the "Primordial" it became very conservative.
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