Amphineura

from WordNet (r) 3.0 (2006)

Amphineura
    n 1: a class of Gastropoda [syn: {Amphineura}, {subclass
         Amphineura}]

from The Collaborative International Dictionary of English v.0.48

Amphineura \Am`phi*neu"ra\, n. pl. [NL., fr. 'amfi` + ? sinew,
   nerve.] (Zool.)
   A division of Mollusca remarkable for the bilateral symmetry
   of the organs and the arrangement of the nerves.
   [1913 Webster]