閉錐
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}.]
phragmocone
n : the thin conical chambered internal shell (either straight
or curved) of a belemnite [syn: {phragmacone}]