exuviae

‖ n. pl. [ L., fr. exuere to draw out or off, to pull off. ] 1. (Zoöl.) 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. [ 1913 Webster ]

2. (Geol.) The fossil shells and other remains which animals have left in the strata of the earth. [ 1913 Webster ]