A Chiragra Spider Conch seashell, Harpago chiragra, family Strombidae.
Cone shells - leopard cone snail (Lithoconus leopardus) and marbled cone snail (Conus marmoreus). These are shells of predatory, venomous sea snails.
A Scallop seashell. Scallops are saltwater clams or bivalves in the family Pectinidae. The elegant fan shape is an iconic image of marine life.