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from the GNU version of the Collaborative International Dictionary of English

  • A group of Crustacea in which the eyes are without stalks; the Arthrostraca.

from The Century Dictionary and Cyclopedia

  • The sessile-eyed crustaceans; one of the two great divisions of the higher (malacostracous as distinguished from entomostracous) Crustacea, having fixed sessile eyes not borne upon a movable stalk, as in the Podophthalma (which see), no solid carapace or cephalothorax, the head, thorax, and abdomen distinct, and the thorax segmented like the abdomen.
  • In conchology, a tribe of gastropods having the eyes on the outer side of the base of the tentacles. It includes most of the proboscis-bearing forms.


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