interesting results. These beds lie flat on vertical Devonian, Silurian, Ordovician, or Cambrian, and the included pebbles are recognizable fragments of the underlying rocks. Dr. Bagg considers the cherts to be Cambrian or Ordovician, and has identified seventeen genera and forty-five species of Foraminifera, many Sponges, some Kadiolaria, Bryozoa, etc. The Foraminifera are uncrushed, present perfect outlines, and reveal many genera (as Virgatwa and Bolivina) usually associated with more recent

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... deposits. The paper is illustrated with four plates, and the carefully drawn figures of the sectioned specimens are placed side by side with the recent form. Altogether an important and interesting communication, involving a great deal of study and knowledge.