Posted: Jun 20 2016

 Gemma gemma (Totten, 1834), Amethyst Gem Clam

This presentation is incomplete for lack of sample specimens of the principal form that is purplish, glossy, and with only fine concentric grooves. Thanks to Amy Tripp for providing specimens to allow completion of this presentation.

R Gemma 1
R Gemma 1
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R Gemma 2
R Gemma 2
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R Gemma 3
R Gemma 3
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R Gemma 4
R Gemma 4
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R Gemma 5
R Gemma 5
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