Excerpt from Observations on the Genus Union: Together With Descriptions of New Genera and Species in the Families Naiades, Conchae, Colimacea, Lymnaeana, Melaniana and Peristomiana; Consisting of Four Memoirs Read Before the American Philosophical Society From 1827 to 1834
IN closing this volume, which I now do with my fourth Memoir, I look back with peculiar pleasure on the hours employed in investiga ting that family (the Naiades) which has been my chief study in zoology. Induced at first to the study of conchology by the desire of promoting my knowledge of geology, which recent discoveries prove to be almost a blank sheet without the chart of its sister science, I found myself launched into a new and delightful ocean, culling and choosing among nature's choicest and most favoured works. The geologists of the new schools regard shells as indicating, in the most positive and direct manner, nearly all the strata above the primitive, from the 'lowest Fossiliferous Group' of De la Beche, to the high est of the series, the 'modern Group, ' (the 'recent Period' of Lyell).
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