A Guide to the Fossil Mammals and Birds in the Department of Geology and Palĉontology in the British Museum (Natural History) ...: With 6 Plates and 88 Text-figures

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order of the Trustees [by W. Clowes and sons, limited], 1904 - Birds, Fossil - 100 pages
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Page i - Reptiles and Fishes in the Department of Geology and Palaeontology in the British Museum (Natural History).
Page 24 - Diagram showing the gradual loss of toes in the fore foot (a) and increase of complexity in the grinding teeth (6) of successive Horselike Ungulata from Europe— namely, Hyracotherium (4), Anchitherium (3), Hipparion (2), and Equus (1) ; much reduced, but not showing relative size. Digits numbered i, n, iv. North America, by slightly smaller animals, which are already horses in every essential respect, but have a pair of complete though diminutive...
Page 59 - T. longirostris, the posterior lower molar is very similar . 21. Grinding-surface of a lower molar tooth of Mastodon sivalensis. From the Lower Pliocene of the Siwalik Hills, India. -J nat. size. to that of M. latidens, which in its turn approaches Elephas (Stegodon) clifti (fig. 22) very closely. In M. latidens there are, as a rule, five transverse ridges in the second upper molar and six in the last. ELEPHAS. The next stage is represented by Elephas (Stegodon) clifti (fig.
Page 18 - Table-cases a ^ tne no of e( l animals were five-toed; but most of them soon 4, 5. began to exhibit a tendency towards the reduction of the spreading foot. In one group comprising the existing tapirs, rhinoceroses, and horses, the whole weight of the body gradually became concentrated on the middle toe, so that this grew stout at the expense of the other toes. Thus arose the uneven-toed hoofed animals or Perissodactyla. The tapirs retain four toes on the fore foot, three on the hind foot; the rhinoceroses,...

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