sand saucer

Webster's Dictionary (1913)

Zoology, the mass of egg capsules, or oothecae, of any mollusk of the genus Natica and allied genera. It has the shape of a bottomless saucer, and is coated with fine sand; — called also sand collar.

From the entry Sand.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54