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A. Hinge plate of an isolated left valve (FMNH Z.48). B. Interpretative drawing of A. C. Conjoined pair of valves (FMNH Z.31) in left lateral view. D. FMNH Z.31 in dorsal view. Abbreviations: aas, anterior adductor scar; act, anterior cardinal tooth; e, escutcheon; ln, ligamental nymph; mct, median cardinal tooth; pplt, posterior pseudolateral tooth; s, socket; u, umbo. Scale bar equals 20 mm.
