. The geological history of plants. Paleobotany; 1888. LAURENTIAN AND EARLY PALEOZOIC. 29 Glimactichniies, from the same beds which afford Pro- tichnites. The principal difference between Protichnites and their modern representatives is that the latter hare two lateral furrows produced by the sides of the cara- pace, which are wanting in the for- mer. I subsequently applied the same explanation to sev- eral other ancient forms now known under the gener- al name Bilobites (Figs. 6 and 7).* The tubercu- lated impressions known as Phyma- toderma and Gaul- erpites may, as Zeil- ler has shown, be m
. The geological history of plants. Paleobotany; 1888. LAURENTIAN AND EARLY PALEOZOIC. 29 Glimactichniies, from the same beds which afford Pro- tichnites. The principal difference between Protichnites and their modern representatives is that the latter hare two lateral furrows produced by the sides of the cara- pace, which are wanting in the for- mer. I subsequently applied the same explanation to sev- eral other ancient forms now known under the gener- al name Bilobites (Figs. 6 and 7).* The tubercu- lated impressions known as Phyma- toderma and Gaul- erpites may, as Zeil- ler has shown, be made by the bur- rowing of the mole- cricket, and fine examples occurring in the Clinton forma- tion of Canada are probably the work of Crustacea. It is probable, however, that some of the later forms referred to these genera are really Algse related to Caulerpa, or even branches of Conifers of the genus BrachypJiyllum. Nereites and Planulites are tracks and burrows of worms, with or without marks of setas, and some of the. Fig. 7.—BuaophyeM (RusichnUe») GfrmviUen- sis, an Eiuiinal burrow of the Siliwo-Cam- brian, probably of a crustacean, a, Track connected with it. * The name BUobites was originally proposed by De Kay for a bivalye shell (Conocardiitm). Its application to supposed Algse was an error, but this is of the less consequence, as these are not true plants but only anitual Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, John William, Sir, 1820-1899. New York, D. Appleton and Company
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