We think it likely that the cra- nidium of Reed.s Calymene (Pharostoma) lilu- ensis is now referable to Xuanenia (see Tripp et al., 1989), a genus otherwise known only from the South China platform. Reed.s Cheirurus sub- mitis is very similar to Hadromeros xiushanensis (Sheng), a species widespread in the later Ordo- vician over the South China platform (see Ji, 1986). The species Reed described as Holometo- pus wimani would now be assigned to Dula- naspis Chugaeva, a genus also described from the Caradoc Gondwanan marginal terranes of Kazakhstan and Kirgizia. In general, the species comparisons of the trilobites suggest to us that the Upper Naungkangyi Beds may be of Lland- eilo to Caradoc age, rather than somewhat older as Reed suggested. Virtually all the forms named by Reed require reconsideration in modern tax-