Abstract

The various families which have been proposed for Mesozoic rhynchonelloids are re-examined. The family Dimerellidae is revised and a new family and genus are proposed for the remarkable Rhaetic brachiopod 'Rhynchonella' cornigera (Schafhaeutl). Internal details are given for this species and for Sulcirostra seguenzae (Gemmellaro) of the Dimerellidae. Three new subfamilies are proposed within the Dimerellidae.

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