. A guide to the fossil mammals and birds in the Department of geology and palontology in the British Museum (Natural history) ... With 6 plates and 88 text-figures . ne formations, with deeper and more effective cusps on Table-casethe molar teeth. As shown by numerous skulls of Csenothe- ®* rium (Fig. 24), there is often a slight gap l)etween its caninetooth and the premolars. The Xiphodontidae are small two-toed animals from the Upper Eocene and Oligocene ofEngland, France, and adjoining countries. Dichodon (Fig. 26)is a typical genus. The Oreodontidae are more advancedruminants ranging from
. A guide to the fossil mammals and birds in the Department of geology and palontology in the British Museum (Natural history) ... With 6 plates and 88 text-figures . ne formations, with deeper and more effective cusps on Table-casethe molar teeth. As shown by numerous skulls of Csenothe- ®* rium (Fig. 24), there is often a slight gap l)etween its caninetooth and the premolars. The Xiphodontidae are small two-toed animals from the Upper Eocene and Oligocene ofEngland, France, and adjoining countries. Dichodon (Fig. 26)is a typical genus. The Oreodontidae are more advancedruminants ranging from the Upper Eocene to the UpperMiocene in Xorth America. Skulls of Orcodon are exhibited,showing the lower canine tooth shaped like an incisor, whilethe foremost premolar is enlarged to usurp its function. TheProtoceratidae are an Oligocene North American family, inwhich the males bear at least two pairs of bony bosses (or horns ) on the head. The nearest surviving relatives of these primitiveruminants are the little chevrotains, or Tragulidse, whichare now found only in tlie marshes of the Indo-j\Ialayanregion and western Africa. They never possess horns, but. Fig. 25.—Side-view of skull and mandible of existing Chevrotaiu (Tragulusjavanicus), from the Malayan region ; reduced in size. tliey agree with the giraffes, deer, and antelopes in having noupper front teeth (Fig. 25). Prodremotherium, from theOligocene of France, is essentially similar to the living7raf/u/ns, with tlie enlarged upper canine teeth. Dorcathe-rhnn, of which a fine skull is shown from the Lower Plioceneof Ep])(lsheim, Hesse-Darmstadt, is apparently identicalwith the living Hynmoschus. Of the true ruminants the Tylopoda, or camels and Pier-casellamas, seem to have originated in Xorth America, where ^*they can be traced liack by fossils from the Pliocene andMiocene formations to a little ga2:elle-sha])ed creature of theOligocene period, Poehrothninm. This small animal, ofwhich a skull and limbs are exhibit
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectma, tragulusjavanicus
