from The Century Dictionary.

  • noun A genus of ostracoderm fishes of the order Heterostraci, with the head covered by a simple, triangular, dorsal shield from 3–5 inches long, notched at the orbits and without posterior spine, and by a quadrate ventral shield. One species is from the Salina group of the Silurian in Perry county, Pennsylvania, the other from the Old Red Sandstone of the Scottish Devonian.


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