You know what it looks like… but what is it called?
TAKE THE QUIZ“pot shell”
We have one entry that includes the term pot shell.
watering-pot shell
noun: any of several marine bivalve mollusks (genus Brechites) having small valves consolidated with a capacious calcareous tube which encases the entire animal and is closed at the anterior end by a convex disk perforated by many pores like the nozzle of a watering pot
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Merriam-Webster unabridged