Principles of Animal Biology

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ... were at first provided with straight partitions, later with partitions whose edges were bent, crooked and finally lobed in a very complicated manner. Since in the fossils both the young and old stages of each individual shell are preserved it is possible to compare the individual development with the racial ...

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