. Elements of geology : a text-book for colleges and for the general reader. Geology. 418 MESOZOIC ERA—AGE OF REPTILES. Labyriniliodonts have already been described, in connection with the Carboniferous when they first occur. They culminate, however, in size and in com- plexity of tooth- structure'—if not in number and variety — in the Triassic, and then become extinct. Fig. 612. In some cases they reached gigantic proportions. The head of the Mas- todonsaurus (Fig. 615) wTas three feet long and two feet wide. The tooth of the typi- cal genus Labyrinthodont was three and a half inches long and
. Elements of geology : a text-book for colleges and for the general reader. Geology. 418 MESOZOIC ERA—AGE OF REPTILES. Labyriniliodonts have already been described, in connection with the Carboniferous when they first occur. They culminate, however, in size and in com- plexity of tooth- structure'—if not in number and variety — in the Triassic, and then become extinct. Fig. 612. In some cases they reached gigantic proportions. The head of the Mas- todonsaurus (Fig. 615) wTas three feet long and two feet wide. The tooth of the typi- cal genus Labyrinthodont was three and a half inches long and one and a half in diameter at the base (Fig. 617). The complex labyrinthine structure is shown in Fig. 618. Attention was first drawn to these. Fig. 613. Fig. 614. Figs. 612-614.—Triassic Fishes: 612. a, Dental Plate of Ceratodus ser- ratus; b, Dental Plate of Ceratodus altns. Keuper (after 613. Acrodus minimus. 614. Hybodus apicalis (after Agassiz).. 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
