Thorn-headed worm

from The Collaborative International Dictionary of English v.0.48

Thorn-headed \Thorn"-head`ed\, a.
   Having a head armed with thorns or spines.
   [1913 Webster]

   {Thorn-headed worm} (Zool.), any worm of the order
      Acanthocephala; -- called also {thornhead}.
      [1913 Webster]