The Collaborative International Dictionary
Spur-shell
Spur-shell \Spur"-shell`\ (sp[^u]r"sh[e^]l`), n. (Zo["o]l.) Any one of several species of handsome marine gastropod shells of the genus Trochus, or Imperator. The shell is conical, with the margin toothed somewhat like the rowel of a spur.
Wiktionary
spur-shell
n. Any of several species of conical gastropod shells in the family (taxlink Trochidae family) and (taxlink Astraea genus nomul=1), the margin of the shells being toothed somewhat like the rowel of a spur.