Abstract

Study of Silurian and Devonian orthotetacid brachiopods from northern Maine has brought into question the proper generic identity of specimens usually referred to Fardenia in the Silurian of North America and Europe. Study of the Silurian material demonstrated that most specimens belong to a previously undescribed genus, Chilidiopsis, here assigned to a new family, which is generically distinct from Fardenia though probably derived from it. Study of the collections in the U. S. National Museum suggests that the new genus described below is the commonest orthotetacid in the Silurian of North America and western Europe, but that Schell-wienella-like forms also occur with it. Schellwienella-like forms are rare in the Silurian but are more abundant in rocks of post-Silurian age. The type species of the new genus, "Fardenia" reedsi Amsden, 1951, is well illustrated by Amsden (1951); "Schuchertella" roemeri Foreste, 1909, here assigned to the new genus, is also well illustrated by Amsden (1949). The reader is referred to these papers for additional illustrations of the new genus.

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