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Rh in common with those of the Carboniferous group, namely, six Echinoderms, one Crustacean, six Bryozoons, twenty-four Brachiopods, four Lamellibranchiates, ten Gasteropods, and seven Cephalopods, but no corals or sponges; so that it cannot be said that "there is a blending of Silurian and Carboniferous corals in Devonshire," whatever there may be elsewhere; for though, as has been stated, three Silurian corals have been found, not one referable to the Carboniferous Fauna has been met with there. This assertion is made on the authority of Messrs. Edwards and Haime, who, in their monograph on 'The British Fossil Corals from the Mountain Limestone,' state that "seventy-six species have already been found in the deposits appertaining to this geological division, and the presence of none of these corals has as yet been satisfactorily proved in beds belonging to any other period." Again, in their monograph on 'British Devonshire Fossil Corals,' they say,—"Three of these Devonian fossils exist also in the Silurian rocks, but all the others appear to be peculiar to the Devonian period." This was the language, in 1853, of the zoophytologists selected by the Palæontographical Society to prepare a monograph on this branch of palæontology, who were thoroughly acquainted with the literature of the subject, and who had had access to almost every public and private museum and collection in the United Kingdom.

The fifty-eight species which passed from the Devonian to the Carboniferous period are found in the three principal fossiliferous deposits of Devon and Cornwall, as exhibited in the following table:—

It is, perhaps, worthy of remark that the five areas have a smaller number of organic forms in common with one another—closely connected as they are both in space and time—than they have, as a whole, with Devonian deposits in continental Europe and elsewhere beyond the British Isles, or with the Carboniferous rocks of Ireland and central and northern England.