. Animal biology. Biology; Zoology; Physiology. 370 ANIMAL BIOLOGY geographical barriers. We know, for example, that a litter of European Rabbits was introduced on the small island of Porto Santo during the fifteenth century and by the middle of the last century its descendants had become so distinct from the parent form that they were described as a new species. (Fig. 92.). Fig. 237. — Successive forms of a Snail, Paludina, from the Tertiary deposits of Slavonia. (From Lull, after Neumayr.) As a matter of fact the characteristic fauna of islands was what impressed Darwin with the need of some
. Animal biology. Biology; Zoology; Physiology. 370 ANIMAL BIOLOGY geographical barriers. We know, for example, that a litter of European Rabbits was introduced on the small island of Porto Santo during the fifteenth century and by the middle of the last century its descendants had become so distinct from the parent form that they were described as a new species. (Fig. 92.). Fig. 237. — Successive forms of a Snail, Paludina, from the Tertiary deposits of Slavonia. (From Lull, after Neumayr.) As a matter of fact the characteristic fauna of islands was what impressed Darwin with the need of some interpretation of their origin other than by special creation. During his famous three years' voyage around the world on the "Beagle," he stopped at the Galapagos Islands, situated about 600 miles off the west coast of South America, and was astonished to find that although the fauna as a whole resembled fairly closely that of the mainland, neverthe- less the species for the most part not only were different, but even those of the separate islands were distinct — the islands nearest to. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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