What is "corystes cassivelaunus"

Masked \Masked\, a.

1. Wearing a mask or masks; characterized by masks; concealed; hidden.

2. (Bot.) Same as Personate.

3. (Zo["o]l.) Having the anterior part of the head differing decidedly in color from the rest of the plumage; -- said of birds.

   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 (Zo["o]l.), a European crab ( Corystes cassivelaunus) with markings on the carapace somewhat resembling a human face.

   Masked pig (Zo["o]l.), a Japanese domestic hog ( Sus pliciceps). Its face is deeply furrowed.