Agnostus Nudus

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“Four stages in the development of the trilobite Agnostus nudus. A, Youngest stage with no mesosomatic somites; B and C, stages with two mesosomatic somites between the prosomatic and telsonic carapaces; D, adult condition, still with only two free mesosomatic somites.” — The Encyclopedia Britannica, 1910


The Encyclopedia Britannica, Eleventh Edition (New York: The Encyclopedia Britannica Company, 1910)II:301


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