资料来源 : Webster's Revised Unabridged Dictionary (1913)

Spur-shell \Spur"-shell`\, n. (Zo["o]l.)
   Any one of several species of handsome gastropod shells of
   the genus {Trochus}, or {Imperator}. The shell is conical,
   with the margin toothed somewhat like the rowel of a spur.