Source : Webster's Revised Unabridged Dictionary (1913)

Scaphognathite \Sca*phog"na*thite\, n. [Gr. ska`fh boat +
   gna`qos jaw.] (Zo["o]l.)
   A thin leafike appendage (the exopodite) of the second
   maxilla of decapod crustaceans. It serves as a pumping organ
   to draw the water through the gill cavity.