The transcendent value of graptolites for correlation has been demonstrated in two articles received recently on faunas of southwestern and northwestern China. In the faunas from the southwestern region, Yin and Lu1 list a large number of invertebrates. Among these the graptolites are particularly well represented, especially in the Silurian where the species are so well developed that correlation can be made for parts of the formation with four different divisions of the Silurian of Great Britain, namely, Lower Valentian, Upper Valentian, Wenlock, and Ludlow. In noting the presence of rich faunas of other invertebrates in the Ordovician, it...
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