The Collaborative International Dictionary of English v.0.48:

Comatula \Co*mat"u*la\ (?; 135), n. [NL., fr. L. comatulus
   having hair neatly curled, dim. fr. coma hair.] (Zool.)
   A crinoid of the genus Antedon and related genera. When
   young they are fixed by a stem. When adult they become
   detached and cling to seaweeds, etc., by their dorsal cirri;
   -- called also feather stars.
   [1913 Webster]