. Elements of geology. Geology. Acrodus nohilis, Agas. tooth; commonly called fossil leach. Lias, Lyme Regis, and Germany. But the remains of fish which have excited more attention than any others, are those large bony spines called ichthyodo- rulites (a. Fig. 225.), which were once supposed by some natu- Fig. 225. a b. Hybodus reticulatus, Agas. Lias, Lyme Regis. a. Part of fin, commonly called Ichthyodorulite. 6, Tooth. ralists to be jaws, and by others weapons, resembling those of the living Balistes and Silurus ; but which M. Agassiz has shown to be neither the one nor the other. The spine
. Elements of geology. Geology. Acrodus nohilis, Agas. tooth; commonly called fossil leach. Lias, Lyme Regis, and Germany. But the remains of fish which have excited more attention than any others, are those large bony spines called ichthyodo- rulites (a. Fig. 225.), which were once supposed by some natu- Fig. 225. a b. Hybodus reticulatus, Agas. Lias, Lyme Regis. a. Part of fin, commonly called Ichthyodorulite. 6, Tooth. ralists to be jaws, and by others weapons, resembling those of the living Balistes and Silurus ; but which M. Agassiz has shown to be neither the one nor the other. The spines, in the genera p. ^^^^ metinoned, articu- ^* ' a, ^ ^^t'^ the back- bone, whereas there are no signs of any such articulation in the ichthyodorulites. These last appear to have been bony spines which formed the an- terior part of the dor- r,,- . * sal fin, like that of the ChimcBra vionstrosa.* . ' a. Spine forming anterior part of the dorsal fin. living genera Cestra-. 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 Lyell, Charles, Sir, 1797-1875; Gibbes, Lewis Reeve, 1810-1894, former owner. DSI; Merrill, George P. (George Perkins), 1854-1929, former owner. DSI. Philadelphia : James Kay, Jun. and Brother ; Pittsburgh : C. H. Kay & Co.
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Keywords: ., bookauthorlyellcharlessir17, bookcentury1800, booksubjectgeology
