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Webster 1913 Edition
Cephalaspis
‖
Cephˊa-las′pis
,Noun.
[NL., fr. Gr.
κεφαλή
head + [GREEK] 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.