The Collaborative International Dictionary of English v.0.48:

Annelida \An*nel"i*da\, n. pl. [NL. See Annelid.] (Zool.)
   A division of the Articulata, having the body formed of
   numerous rings or annular segments, and without jointed legs.
   The principal subdivisions are the Ch[ae]topoda, including
   the Oligoch[ae]ta or earthworms and Polych[ae]ta or
   marine worms; and the Hirudinea or leeches. See
   Ch[ae]topoda.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Annulata \An`nu*la"ta\, n. pl. [Neut. pl., fr. L. annulatus
   ringed.] (Zool.)
   A class of articulate animals, nearly equivalent to
   Annelida, including the marine annelids, earthworms,
   Gephyrea, Gymnotoma, leeches, etc. See Annelida.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Annelida
    n 1: segmented worms: earthworms; lugworms; leeches [syn:
         Annelida, phylum Annelida]