Palæontological Notes on the Brachiopoda

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Abstract
In my last communication, I endeavoured to lay before the reader all the more important facts, already acquired, relative to the genera and sub-genera that are provided with spiral appendages for the support of the oral arms; and at the same time I referred to several points which still required to be elucidated and explained before the subject could be considered to have been satisfactorily studied.

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