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The group ofForaminifera being one as to the structure and physiology of which our knowledge is confessedly very imperfect and for the natural classification of which there is consequently no safe basis, the author has undertaken a careful study of some of its chief typical forms, in order to elucidate (so far as may be possible) their history as living beings, and to determine the value of the characters which they present to the systematist.

II. Researches on the Foraminifera.—Part I. General introduction, and monograph of the genus Orbitolites