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18.119.143.45
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From: Webster's Revised Unabridged Dictionary (1913)

 Pro·ös·tra·cum n.; pl. Proostraca   Zool. The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone.
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