A Beginner's Guide to Shells

Are you a seashell novice? Use our helpful guide to figure out what you've found.

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Turret or Screw Shells
Jean Allsopp

Turret or Screw Shells

  • There are 17 species of turret or screw shells inhabiting North American waters.
  • These large shells are sized between one inch to 5 inches.
  • Look for convex whorls and spiral coils, with a circular aperture.

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