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These are all hexagonal in cross-section, as you can easily tell if you roll them between your fingertips.
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San Diego County, California, US
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San Diego County, California, US
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San Diego County, California, US
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San Diego County, California, US
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San Diego County, California, US
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San Diego County, California, US Micros found sifting through sand and shell fragments. Size markings are in millimeters.
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San Diego County, California, US Micros found sifting through sand and shell fragments. Size markings are in millimeters.
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San Diego County, California, US Micros found sifting through sand and shell fragments. Size markings are in millimeters.
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San Diego County, California, US Micro shells found by sorting through sand and shell fragments.