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From The Collaborative International Dictionary of English v.0.48:
Malacopoda \Mal`a*cop"o*da\, prop. n. pl. [NL., fr. Gr. malako`s soft + -poda.] (Zool.) A class of air-breathing Arthropoda; -- called also Protracheata, and Onychophora. [1913 Webster] Note: They somewhat resemble myriapods, and have from seventeen to thirty-three pairs of short, imperfectly jointed legs, two pairs of simple jaws, and a pair of antennae. The trancheae are connected with numerous spiracles scattered over the surface of the body. Peripatus is the only known genus. See Peripatus. [1913 Webster]