Examination of epon-mounted single specimens of Palmatolepis sp. and Polygnathus sp. by transmission electron microscopy shows the bulk of these conodonts to be composed of subparallel crystallites oriented parallel to the long axis of the conodont. A series of nodes along the blade axis is formed of concentrically oriented crystallites enclosing unoriented material tentatively identified as “white matter.” Additional features include “scarps” possibly related to lamination and zones of disoriented crystallites in Palmatolepis sp. and a crude layering of subparallel and massive crystallites in Polygnathus sp. In addition, the pattern of pitting, breaks, “canals,” and crystallite shapes differs in the two genera.

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