Cute Young Brunette Girl Reveals On The Beach With A Seashell

• Vertebrate "shells": chelonians
Sea turtles have a carapace and plastron of bone and cartilage which is developed from their ribs. Infrequently a turtle "shell" will wash up on a beach.
• Hard corals
Pieces of the hard skeleton of corals commonly wash up on beaches in areas where corals grow.