The Collaborative International Dictionary of English v.0.48:

Anatifa \A*nat"i*fa\, n.; pl. Anatif[ae]. [NL., contr. fr.
   anatifera. See Anatiferous.] (Zool.)
   An animal of the barnacle tribe, of the genus Lepas, having
   a fleshy stem or peduncle; a goose barnacle. See
   Cirripedia.
   [1913 Webster]

   Note: The term Anatif[ae], in the plural, is often used for
         the whole group of pedunculated cirripeds.
         [1913 Webster]