¹ As it is quite superfluous to repeat here the reasons stated by Lapworth (see op. cit.), in our opinion most satisfactorily, for his proposed name, Ordovician, we will only point out that this name, apart from the fact that its meaning offers a way out of a difficulty in nomenclature acceptable to the various English schools, is also made necessary, so to speak, for us, since on the one hand we wish to retain the name Cambrian, but on the other hand wish to use the name Silurian exclusively as a collective appellation.

² However, J. Kiaer, in his Das Obersilur im Kristianiagebiete, which has just appeared, expresses the opinion that the lowest strata in Gothland correspond to the uppermost part of Llandovery; the lower part of the latter is therefore inaccessible in Gothland. Moreover, he questions whether there is anything there to correspond to the most recent Ludlow strata.