Abstract

A new rhynchonelloid brachiopod genus, Boucotella, is based on the species Camarotoechia gigantea Maynard from the Upper Silurian part of the Keyser Limestone of Virginia, West Virginia, and Maryland. Rhynchonella tennesseensis Roemer (in part) from the Brownsport Formation is also assigned to the genus. These two species are not congeneric with Trigonirhynchia sulcata Cooper from the Waldron Shale, but the three form a closely related family group. Three stages in the evolution of the cardinal process are shown by these species.

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