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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

Agnostus Nudus

"Four stages in the development of the trilobite Agnostus nudus. A, Youngest stage with no mesosomatic…

"These words, besides denoting absolute nakedness, were applied to any one who, being without an Amictus, wore only his tunic or indutus. In this state of nudity the ancients performed the operations of ploughing, sowing and reaping. The accompanying woodcut shows a man ploughing in his tunic only. This term applied to the warrior expressed the absence of some part of his armour." — Smith, 1873

Nudus

"These words, besides denoting absolute nakedness, were applied to any one who, being without an Amictus,…