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USNM 1450564 - Specimen Image 7
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Eucidaris tribuloides (Lamarck, 1816) (USNM E32990) aboral view Scale: 1 cm
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USNM 1450564 - Specimen Image 5
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USNM 1448822 - Specimen Image 1
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ventral
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dorsal
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lateral
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Tretocidaris bartletti (Agassiz, 1880) (USNM E32266) oral view Scale: 4 cm
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Tretocidaris bartletti (Agassiz, 1880) (USNM E32266) spine detail Scale: 4 cm
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Tretocidaris bartletti (Agassiz, 1880) (USNM E32266) aboral view Scale: 4 cm