The specimens dealt with here were furnished by Prof.K.C.Yang and Miss W.S.Wu in 1961 to the writer for study.They were collected from the lower part of theShizixu formation of Luocheng and Huanjiang districts,Kwangsi province and from thelower part of the Kolaoho formation of Dushan and Duyun districts,southern Kuei-chow province.All the stromatoporoids obtained from Kwangsi are associated with coral:Cystophrentis sp.;and those from Kueichow are associated with brachiopods:Schucher-tella sp.,Athyris sp.,Camarotoechia sp.,a little bit below the horizon of Cystophrentis.