Gümbel has further found in beds overlying the older Eozoic series, and probably of the same age with the Canadian Huronian, a different species of Eozoon, with smaller and more contracted chambers, and still finer and more crowded canals. This, which is to be regarded as a distinct species, or at least a well-marked varietal form, he has named _Eozoon Bavaricum_ (Fig. 56). Thus this early introduction of life is not peculiar to that old continent which we sometimes call the New World, but applies to Europe as well, and Europe has furnished a successor to Eozoon in the later Eozoic or Huronian period. [Illustration: Fig. 56.--_Section of Eozoon Bavaricum, with Serpentine, from the Crystalline Limestone of the Hercynian primitive Clay-slate Formation at Hohenberg; 25 diameters (probably Huronian)._ (_a_) Sparry carbonate of lime, (_b_) Cellular carbonate of lime, (_c_) System of tubuli. (_d_) Serpentine replacing the coarser ordinary variety, (_e_) Serpentine and hornblende replacing the finer variety, in the very much contorted portions.] In rocks of this age in America, after long search and much slicing of limestones, I have hitherto failed to find any decided foraminiferal remains other than the Tudor and Madoc specimens, which may be of this age. They are laminated forms resembling Eozoon, but I have reason to believe that their minute structure more closely resembles that of Cryptozoon, though it is somewhat obscure. If these are really Huronian and not Laurentian, the Eozoon from this horizon does not sensibly differ from that of the Lower Laurentian. We are indebted to Mr. Matthew, of St. John, New Brunswick, who has so greatly distinguished himself by his discoveries in the Cambrian of that region, for some remarkable additions to the contemporaries of Eozoon. One of these is a laminated body, like Eozoon in its general appearance, but growing in crowded masses which by mutual pressure become columnar (Fig. 57). In the best preserved specimens each layer seems to consist of a thin lamina separated from its neighbours by a finely granular mass, traversed by innumerable irregular tubes. This recalls the structure of Cryptozoon of Hall, which, as we have seen, is found in pre-Cambrian rocks in Colorado, and abounds in the Upper Cambrian in New York, in Minnesota, and in different parts of Canada, but Archæozoon differs in its form and habit of growth. If the Stromatoporæ of the Ordovician and Silurian are hydroids, this may also be the case with Cryptozoon; but so far as its own structure is concerned, it approaches most nearly to the fossils known as Loftusia in the Carboniferous and later formations, and these are generally regarded as Foraminiferal. We may thus have another giant Foraminiferal organism which contributed to the building up of rocks in the Laurentian seas. [Illustration: Fig. 57.--_Archæozoon Acadiense_, Matthew. _Diagrammatic transverse and longitudinal sections of a small specimen._