In Gymnophiona the vertebrae are biconcave and are very numerous, they sometimes number about two hundred and thirty.
The vertebræ of its backbone are not biconcave, but flat in front and behind.
The vertebrae may be solid or their centra may be hollowed internally; their surfaces may be flat, biconcave or opisthocoelous.
The end result is an amphicoelous or biconcave centrum in general appearance much like that of the Selachian.
Owing to the beaded structure of the notochord the vertebral bodies take of necessity a biconcave hourglass-shaped form.
The vertebræ are very numerous and biconcave as in ordinary fishes.
The vertebral centra are flat or biconcave, and neither they nor the limb bones are hollowed out by internal cavities.
In the mammal they are biconcave disks with bevelled edges, they do not contain a nucleus so that they are not cells.
The vertebrae are solid and may be opisthocoelous, biconcave, or flat.
It was composed of vermiform rods 1⁄1000 inch in width, and breaking up into cylindrical segments with biconcave ends.
biconcave bi·con·cave (bī'kŏn-kāv', bī-kŏn'kāv')
Concave on both sides or surfaces.