The Collaborative International Dictionary of English v.0.48:

Nemertina \Nem`er*ti"na\ (n[e^]m`[~e]r*t[imac]"n[.a]), prop. n.
   pl. [NL. See Nemrtes.] (Zool.)
   An order of helminths usually having a long, slender, smooth,
   often bright-colored body, covered with minute vibrating
   cilia; -- called also Nemertea, Nemertida, and
   Rhynchocoela.
   [1913 Webster]

   Note: The mouth is beneath the head, and the straight
         intestine at the posterior end. They have a very
         singular long tubular proboscis, which can be everted
         from a pore in the front of the head. Their nervous
         system and blood vessels are well developed. Some of
         the species become over one hundred feet long. They are
         mostly marine and seldom parasitic; a few inhabit fresh
         water. The two principal divisions are Anopla and
         Enopla.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Nemertea
    n 1: proboscis worms [syn: Nemertea, phylum Nemertea,
         Nemertina, phylum Nemertina]