from The Century Dictionary and Cyclopedia

  • n. The typical genus of Pseudoniscidæ.
  • n. A small fossil merosto-matous arthropod found in the Silurian rocks of the Island of Ösel, Sweden, and in the Salina beds of New York State. The animal has a large horseshoe-shaped smooth head-shield, with genal spines and without eyes, a trilobitic abdomen of 10 segments, and a short, straight, terminal spine.


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