notobranchiata

from The Collaborative International Dictionary of English v.0.48

Notobranchiata \No`to*bran`chi*a*ta\, n. pl. [NL. See {Notum},
   and {Branchia}.] (Zool.)
   (a) A division of nudibranchiate mollusks having gills upon
       the back.
   (b) The Dorsibranchiata.
       [1913 Webster]