Report on the Fossil Remains of Mollusca from the Palæzoic Formations of the United States contained in the Collection of Charles Lyell, Esq.; with Remarks on the Comparison of the North American Formulations with those of Europe

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Abstract
The following remarks have grown out of the examination of the fossil Mollusca from the older rocks of the United States, which Mr. Lyell has had the kindness to entrust to me. My principal object has been to ascertain what species are common to the American and European formations; how far such species have had the same duration in the two continents; and how far similar forms of animals have existed in both at what may be supposed to have been the same periods: thus collecting data illustrative of the history of the earlier marine animals. The next object has been to apply this knowledge to the classification of the American formations, and to try to learn how closely we are justified in comparing them with those of Europe.

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