The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone.
n.
The anterior prolongation of the guard of the
phragmocone of belemnites and allied fossil cephalopods, whether horny
or calcareous. See Illust. of Phragmocone.
Usage Examples
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