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Articulata

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Ar`tic`u`la´ta    (är`tĭk`ũ`lā´tå)
n. pl.1.(Zool.) One of the four subkingdoms in the classification of Cuvier. It has been much modified by later writers.
2.One of the subdivisions of the Brachiopoda, including those that have the shells united by a hinge.
3.A subdivision of the Crinoidea.


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In the Articulata we can commence a series with an optic nerve merely coated with pigment, and without any other mechanism; and from this low stage, numerous gradations of structure, branching off in two fundamentally different lines, can be shown to exist, until we reach a moderately high stage of perfection.
 
 
 
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