Source : Webster's Revised Unabridged Dictionary (1913)

Exuviae \Ex*u"vi*[ae]\, n. pl. [L., fr. exuere to draw out or
   off, to pull off.]
   1. (Zo["o]l) Cast skins, shells, or coverings of animals; any
      parts of animals which are shed or cast off, as the skins
      of snakes, the shells of lobsters, etc.

   2. (Geol.) The fossil shells and other remains which animals
      have left in the strata of the earth.

Source : WordNet®

exuviae
     n : cast-off skins or coverings of various organisms during
         ecdysis