The Collaborative International Dictionary of English v.0.48:

Hypostome \Hy"po*stome\, Hypostoma \Hy*pos"to*ma\, n. [NL.
   hypostoma, fr. Gr. "ypo` beneath + ? mouth.] (Zool.)
   The lower lip of trilobites, crustaceans, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Manubrium \Ma*nu"bri*um\, n.; pl. L. Manubria, E.
   Manubriums. [L., handle, fr. manus hand.]
   [1913 Webster]
   1. (Anat.) A handlelike process or part; esp., the anterior
      segment of the sternum, or presternum, and the handlelike
      process of the malleus.
      [1913 Webster]

   2. (Zool.) The proboscis of a jellyfish; -- called also
      hypostoma. See Illust. of Hydromedusa.
      [1913 Webster]