. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Eeliolites porosa, Gol&f., sp. Pontes pyriformis, Lonsd. a. Portion of the same, magnified. Middle Devo- nian, Torquay; Plymouth; Eifel. Aulopora serpens, Goldf. (The young basal portion of a Syrin- gopora, Milne Edw. and Haime.) becomes a cluster of tubes connected by minute processes. In this state it lias been supposed to be a distinct coral, and has been called Syringopora. With the above are found many stone-lilies or crinoids, some of them, such as Cuprcsso
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Eeliolites porosa, Gol&f., sp. Pontes pyriformis, Lonsd. a. Portion of the same, magnified. Middle Devo- nian, Torquay; Plymouth; Eifel. Aulopora serpens, Goldf. (The young basal portion of a Syrin- gopora, Milne Edw. and Haime.) becomes a cluster of tubes connected by minute processes. In this state it lias been supposed to be a distinct coral, and has been called Syringopora. With the above are found many stone-lilies or crinoids, some of them, such as Cuprcssocrinites, of forms generically distinct from those of the Carboniferous Limestone. The mollusks also are no less char- acteristic, among which the genus String'ocephalus (fig. 609) may be. StringocepTialusBurtini, Defr. (Teredratula porrecta, Sow.) Eifel; also South Devon. a. Valves united. 0. Side view of same, c. Interior of larger valve, showing thick partition, and part of a large process which projects from the other valve quite across the shell. mentioned as exclusively Devonian. Many other Brachiopod shells, of the genus Spirifer, &c, abounded, and among them the Atrypa reticularis, Linn. sp. (fig. 627, p. 554), which seems to have been a cosmopolite species occurring in Devonian strata from America to Asia Minor, and which, as we shall hereafter see (p. 554), lived also in the Silurian seas. Among the peculiar lamellibranchiate bivalves com- mon to the Plymouth Limestone of Devonshire and the Continent, we find the Megalodon (fig. 610), together with many spiral univalves, such as MurcJiisonia, Uuomphalus, and Macrocheilus ; and Pteropods such as Conularia (fig. 611). The cephalopoda, such as Cyrtoceras, Gyroceras, and others, are nearly all of genera distinct from those pre- vailing in the Upper Devonian Limestone, or Clymenien-Kalk of the Germans already mentioned (p. 537). Although but few species of Trilobites occur, the characteristic Brontes fiabellifer (fig.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
