Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 SpTicerexochus minis, Beyrich, coiled up. Dudley; also in Ohio, M'. America. Phaeops 'Asap7ius) caudatus, Brong. Wenlock, Aymestry, and Ludlow rocks. tripartite division of the dorsal crust is almost lost (see fig. 639), is very characteristic of this division of the Silurian series; and there are numerous other genera and species. Fig. 639. 1

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