Stars & Shells
Shells are either gastropods (a single solid shell) or bivalves (two parts - examples include clams, oysters and mussels).
Shells in a fire urchin
Murex shell
It looks familiar because it was on Singapore's 75-cent stamp in the olden days of the shell series of stamps. If you were a kid then, it was considered mighty expensive (75-cents was like 7 glasses of cordial from the school canteen). If you were a stamp collector, it was gem to find.
Philippine Mussel
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Electric Clam
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Yes, just because it's called a Helmet Shell doesn't mean you can lift it up and put it on your head.
Unidentified Shells
