corystes cassivelaunus

from The Collaborative International Dictionary of English v.0.48
Masked \Masked\, a.
   1. Wearing a mask or masks; characterized by masks;
      concealed; hidden.
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   2. (Bot.) Same as {Personate}.
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   3. (Zool.) Having the anterior part of the head differing
      decidedly in color from the rest of the plumage; -- said
      of birds.
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   {Masked ball}, a ball in which the dancers wear masks.

   {Masked battery} (Mil.), a battery so placed as not to be
      seen by an enemy until it opens fire. --H. L. Scott.

   {Masked crab} (Zool.), a European crab ({Corystes
      cassivelaunus}) with markings on the carapace somewhat
      resembling a human face.

   {Masked pig} (Zool.), a Japanese domestic hog ({Sus
      pliciceps}). Its face is deeply furrowed.
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