Proostracum

[pru:st'rækəm]

Definition

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

Typist: Preston

Definition

n. the forward continuation of the guard or rostrum in the Belemnites.

Editor: Ned