Bivalves
The apex of a valve of a bivalve is more usually known as the umbo or beak. When the embryonic shell is still present that is known as the prodissoconch.
Read more about this topic: Apex (mollusc)
Famous quotes containing the word bivalves:
“So motionless, she seemed stone dead—just seemed:
She was too old for death, too old for life,
For as if jealous of all living forms
She had lain there before bivalves began
To catacomb their shells on western mountains.”
—Edwin John Pratt (1882–1964)