wing-shell

from The Collaborative International Dictionary of English v.0.48

Wing-shell \Wing"-shell`\, n. (Zool.)
   (a) Any one of various species of marine bivalve shells
       belonging to the genus {Avicula}, in which the hinge
       border projects like a wing.
   (b) Any marine gastropod shell of the genus {Strombus}. See
       {Strombus}.
   (c) Any pteropod shell.
       [1913 Webster]