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With this he gave him four shells, two young, and two grown up ones, which are called the Pteroceras Scorpio; and three others besides, one young and two grown up ones, which go by the name of Cypraea Exanthema.
A limestone of the age of our Portland stone on which this old moraine rests, has its surface polished like a looking-glass, displaying beautiful sections of fossil shells of the genera Nerinaea and Pteroceras, while occasionally, besides finer striae, there are deep rectilinear grooves, agreeing in direction with the course in which the extinct glacier would have moved according to the theory of M. Guyot, before explained.
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