Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n.pl. A division of Arachnida including those spiders which have four lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and the trapdoor spiders. See mygale.

from The Century Dictionary and Cyclopedia

  • A division of Araneina, or true spiders, having four lungs, four spinnerets, and eight approximated ocelli: distinguished from Dipneumones.
  • A group of holothurians, represented by the genus Rhopalodina, having four water-lungs (whence the name). Schmarda. Also called Decacrenidia, Diplostomidea, and Rhopalodinæ.

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