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Seven classes of Holothuria were examined; three belonged to the species of Holothuria, called by Lamarck Fistularia, but which name had already been given by Linnæus to the tobacco-pipe fish; the fourth was a species newly discovered, and to which we appropriated the name of Odontopyga, because the fundament is armed with five calcareous teeth; the belly is furnished with small tubes, and the back covered with bumps.
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