The History of the European Fauna
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In our eReader you can find the full English version of the book. Read The History of the European Fauna Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The History of the European Fauna
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So far the history of the Clausilice seems perfectly simple. An active centre of origin appears to exist in South-eastern Europe, from which the species radiate out in all directions. But when we come to look more closely into the extra-European distribution of the genus, and THE ORIENTAL MIGRATION. 263 especially when we examine its past history, we find that its origin is extremely complex, and dates back to a much more remote period than would have been imagined, had we merely taken into acc...ount its present range in our own continent. Professor Boettger, who is the highest authority on Clausilia, tells us that the genus is known from the earliest deposits of the Tertiary Era. About 700 species are now known, and these have been sub-divided by Professor Boettger and others into a number of sub-genera. Some of these are extinct, but the great majority are still living. The sub-genus Phcedusa occurs in the eocene and oligocene of Southern Europe, but it is extinct as far as our continent is concerned.
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You can find similar books in the "Read Also" column, or choose other free books by Robert Francis Scharff to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
So far the history of the Clausilice seems perfectly simple. An active centre of origin appears to exist in South-eastern Europe, from which the species radiate out in all directions. But when we come to look more closely into the extra-European distribution of the genus, and THE ORIENTAL MIGRATION. 263 especially when we examine its past history, we find that its origin is extremely complex, and dates back to a much more remote period than would have been imagined, had we merely taken into acc...ount its present range in our own continent. Professor Boettger, who is the highest authority on Clausilia, tells us that the genus is known from the earliest deposits of the Tertiary Era. About 700 species are now known, and these have been sub-divided by Professor Boettger and others into a number of sub-genera. Some of these are extinct, but the great majority are still living. The sub-genus Phcedusa occurs in the eocene and oligocene of Southern Europe, but it is extinct as far as our continent is concerned.
What to read after The History of the European Fauna?
You can find similar books in the "Read Also" column, or choose other free books by Robert Francis Scharff to read onlineMoreLess
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