Source : Webster's Revised Unabridged Dictionary (1913)

Malacopoda \Mal`a*cop"o*da\, n. pl. [NL., fr. Gr. ? soft +
   -poda.] (Zo["o]l.)
   A class of air-breathing Arthropoda; -- called also
   {Protracheata}, and {Onychophora}.

   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
         antenn[ae]. The tranche[ae] are connected with numerous
         spiracles scattered over the surface of the body.
         {Peripatus} is the only known genus. See {Peripatus}.

Protracheata \Pro*tra`che*a"ta\, n. pl. [NL. See {Pro-}, and
   {Trachea}.] (Zo["o]l.)
   Same as {Malacopoda}.