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Arnioceras semicostatum

Arnioceras semicostatum

SKU: SIN 3.0
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Internal mould with 7 whorls with some patches of test. Last suture clearly visible and the body chamber occupies 2/3 whorl. Transition from smooth inner whorls to strongly ribbed outer whorls shows well. From Robin Hoods Bay, North Yorkshire.

Size: 54 mm