Cephalaspis \Ceph`a*las"pis\, n. [NL., fr. Gr. kefalh` head + ?
a shield.] (Paleon.)
A genus of fossil ganoid fishes found in the old red
sandstone or Devonian formation. The head is large, and
protected by a broad shield-shaped helmet prolonged behind
into two lateral points.
[1913 Webster]