from The Century Dictionary.

  • noun Pl. sphæridia (-ä). In echinoderms, one of the numerous minute spheroidal bodies, rarely more than one hundredth of an inch long, which are found in nearly all sea-urchins upon the ambulacral plates, especially those nearest the mouth.
  • noun The typical genus of the Sphæridiinæ, comprising mainly African species distinguished by the elongate scutellum and the visible pygidium. S. scarabæoides is an example.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Zoöl.) A peculiar sense organ found upon the exterior of most kinds of sea urchins, and consisting of an oval or sherical head surmounting a short pedicel. It is generally supposed to be an olfactory organ.


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