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6. American Naturalist. 1878. A new fauna, XII, 327-328 (Ed.).
7. Ammon, Ludwig Von. 1889. Die permischen Amphibien der Rheinpfalz, Munich. 1-117, pls. 1-5, with extensive bibliography.
8. Andrews, C. W. 1895. Note on a specimen of Keraterpeton galvani Huxley, from Staffordshire. Geol. Mag., Dec., IV, II, 81-84, fig.
9. Arldt, Theodor. 1907. Die Entwicklung der Kontinente und ihre Lebewelt. 333, Karte 10.
10. ——. 1909. Die Stegocephalen und ihre Stellung unter den Wirbelthieren. Naturw. Rundschau, XXIV, 353-355.
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13. ——. 1875. Description of a new species of Labyrinthodont Amphibian from the Coal at Jarrow Colliery near Castlecomer, Kilkenny. Rept. Brit. Assn. Adv. Sci., 62. (Describes Anthracosaurus edgei.)