IntroductionThe material described in the present paper was collected from the LowerPermian Chihsia limestone by Messrs.K.C.Yang and A.T.Mu in 1951 dur-ing their excursion in Western Hupeh.The Chihsia limestone is underlain by theMaan Coal series containing Lepidodendron ituense and is succeeded by the Mao-kou limestone bearing Verbeekina verbeeki.The most characteristic fossils collect-ed from the Chihsia limestone are:Hayasakaia elegantula Yabe et Hayasaka,Fistulipora chinensis Yoh,Stylidophyllum of intermidicum Huang,Polythecalisof.yangtzeensis Huang,Corwenia of.chihsiaensis Yoh.The Ostracods came