The material described in this paper was collected from the Upper Triassic andMiddle Jurassic formations of Tungchuan,Liulingchuan,Yenhe-Xixingzihe and Dalihe inthe Ordos Basin of Shensi Province by the members of the Geological Expedition of theInstitute of Geology of Lanchow,Academia Sinica,in April,1961.A considerable number of ostracods have been discovered nearly from all formationsin many parts of China,yet the Triassic ostracods are comparatively rare.As far asthe writer is aware,only a few species have been known from the Lower Triassic of