Abstract: The chalicotheres are a comparatively small group of the perissodactyles. While the functional morphology of the peculiar limb bones of the chalicotheres remains always highly attracting for the paleontologists, little attention has been paid to their stratigraphic significance. Working with the material to be described below, the authors found that the chalicotheres are among the most often encountered fossils in the Mid—Tertiary deposits in China. In addition, they evolved rapidly. This makes them important in stratigraphic analysis. For the purpose of comparison the chalicothere materials gathered from the northwest provinces of China (Nei Mongol, Ningxia and Xinjiang), both previously reported and unstudied, are carefully examined. A revision of these specimens will be given elsewhere.

摘要： 记述了兰州盆地新发现的三种爪兽化石:Schizotherium ordosium，Phyllotillon huangheensis sp. nov. 和Chalicotheriinae亚科未定属种的一类。在咸水河组下段南坡坪地方动物群(早渐新世晚期)中发现S. ordosium。这个种的材料较多，其中有保存完好的下颌吻部。这使我们第一次了解了这个属的吻部的构造:吻部很长、具大的铲形下门齿和双叶形的下犬齿。在咸水河组中段(早中新世)张家坪地方动物群中发现了Phyllotillon huangheensis