Source : Webster's Revised Unabridged Dictionary (1913)

Comatulid \Co*mat"u*lid\, n. (Zo["o]l.)
   Any crinoid of the genus {Antedon} or allied genera.

Source : WordNet®

comatulid
     n : free-swimming stalkless crinoid with ten feathery arms;
         found on muddy sea bottoms [syn: {feather star}]