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On conodonts from the Chazy and Cincinnati Group of the Cambro-Silurian, and from the Hamilton and Genesee-Shale divisions of the Devonian, in Canada and the United States
On our present knowledge of the invertebrate fauna of the Lower Carboniferous or Calciferous Sandstone Series of the Edinburgh neighbourhood, especially of that division known as the Wardie Shales; and on the first appearance of certain species in these beds