phragmocone 闭锥
phragmocone[ noun ]
the thin conical chambered internal shell (either straight or curved) of a belemnite
<noun.animal>
Phragmocone \Phrag"mo*cone\, n. [Gr. ?, ?, a fence, an inclosure
+ ? a cone.] (Zo["o]l.)
The thin chambered shell attached to the anterior end of a
belemnite. [Written also {phragmacone}.]