Ⅰ. Introduction The graptolites described in the present paper were collected by Profs. Y. Wang, A. T.Mu, W. T. Chang and others from the Lower Ordovician Dawan formation of the Ichang-Tzekueiarea, western Hupeh during 1956-1957 and by Messrs. W. N. Lee, S. S. Chang and thewriter from the Dawan formation of the Makiang district, southern Kueichou in the springof 1959. More than twenty species belonging to 10 genera are recognized. Among them fourspecies and varities are new. The writer wishes to express his indebtedness to Prof. A. T. Mu for instruction and criticalreading of the manuscript.