The fusulinids dealt with in this paper were collected in 1955 by Mr.L.S.Wong of a field party sent by the Ministry of Geology in the vicinity of BeiyinObo,Inner Mongolia(formerly province Suiyuan).The fusulinid-bearing bedof this area was named by Mr.Wong the Lalaotu limestone.No data of stra-tigraphical sequence of this region are readily available.Since no informationof the fusulines in this region has been hitherto known,the present discoveryaffords therefore some interest.