Note:  Do not rely on this information. It is very old.


Endostyle, the term given to the cartilaginous rod of Amphioxus (q.v.), and the thin line along the ventral side of the branchial cavity of the Ascidians (q.v.). It is regarded as the representative of the vertebral column of the vertebrates or the cartilaginous notochord of the other Chordata (q.v.).