Proostracum

[pru:st'rækəm]

解釋/意思:

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

錄入:普勒斯顿

解釋/意思:

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

錄入:内德