The straight nautiloids are not abundant in the Lower Carboniferous strata of China.The works of studing and collecting have been greatly neglected.Recently,a few speci-mens were collected by Messrs.H.Liu and Y.T.Lin.Among them Mr.Liu describedtwo species from Hunan.In this paper the following species(comprising a full re-description of Liu’s species)are described:Rayonnoceras hunanense(Liu)Rayonnoceras sp.Dolorthoceras guijangense Lai(sp.nov.)Euloxoceras orientale Lai(sp.nov.)Michelinoceras sp.