. The doctrine of descent and Darwinism. Evolution. PEDIGREE OF MAMMALS. 275 of the aboriginal genus is repeated, and Philogenesis is unequivocally expressed in Ontogenesis. The Anchi- therium is a three-toed horse, in which, however, the middle toe has already undertaken the chief task. But in the Hipparion the two side toes are entirely raised from the ground, and by disuse are brought to the con- dition of arrest which is completed in the horse. In the constitution of the molar teeth the tapirs have remained most faithful to the ancestral type. The cir- cumstance that the tapir has four toe
. The doctrine of descent and Darwinism. Evolution. PEDIGREE OF MAMMALS. 275 of the aboriginal genus is repeated, and Philogenesis is unequivocally expressed in Ontogenesis. The Anchi- therium is a three-toed horse, in which, however, the middle toe has already undertaken the chief task. But in the Hipparion the two side toes are entirely raised from the ground, and by disuse are brought to the con- dition of arrest which is completed in the horse. In the constitution of the molar teeth the tapirs have remained most faithful to the ancestral type. The cir- cumstance that the tapir has four toes in front, whereas the Palaeotheridae known to us, have three shows, how- ever, that the genus Palseotherium cannot have been the ancestral stock of the tapirs. For the supposition that the tapir acquired the fourth toe is contrary to all experience respecting the formation of the extremities. Rhinoceroses are also four-toed in front, and their close kindred with the tapirs is testified by the structure of their toes and a series of details in the skeleton. Hippopotami. Pigs. Tragulidse. Deer. Antelopes. Anoplotheridse. An isolated branch of the Palasotheridse seems to be, the fossil genus Macrauchenidae, which combines the. 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 Schmidt, Dr. (Eduard Oskar), 1823-1886. New York, D. Appleton and Co.
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Keywords: ., bookauthorschmidtdreduardoskar1, bookcentury1800, bookdecade1870
