496. ——. 1867. On some fossil reptiles and fishes from the coal strata of Ohio, Kentucky, and Illinois. Proc. Amer. Assn. Adv. Sci., 144-146.
497. ——. 1878. Geology of Jefferson County, Ohio. Geol. Surv. Ohio, III, 736-737.
498. ——. 1889. Palæozoic fishes of North America. Monograph U. S. Geol. Surv., xvi, 228. (Discusses Kammplatten; Amphibia of Linton, Ohio, 211-214; Fauna of Mazon Creek, 214. See also Hodge, 1878, Geol. Surv. Ohio, III, 592.)
499. Nicholson and Lydekker. 1889. Manual of paleontology. Amphibia, II, 1018-1045.
500. Oldham, Dr. R. D. 1875. On a salamandriform Labyrinthodont from the Coal Measures near Castlecomer, Ireland. Rept. Rugby School Nat. Hist. Soc., 74-76, pl. vii.
501. ——. 1893. Geology of India. 2d ed. The Gondwana System, 149.
502. Owen, Sir Richard. 1840-1845. Batrachians. Odontography, 187-218, pls. 62, 63, 64.
503. ——. 1842. On the teeth of the species of the genus Labyrinthodon of Jaeger from the German Keuper and the sandstone of Warwick and Leamington. Ann. and Mag. Nat. Hist., VIII, 58; also, Geol. Trans. II, ser. VI, 503.
504. ——. 1842. Description of parts of the skeleton and teeth of the genus Labyrinthodon. with remarks on Cheirotherium. Trans. Geol. Soc. London, VI, pt. 2, 515-543, pls. xliii-xlvii.
505. ——. 1842. On the teeth of species of the genus Labyrinthodon. Trans. Geol. Soc. London, VI, pt. 2, 503-513, pl. 43, fig. 1. (Discusses validity of term Mastodonsaurus. Read Jan. 11, 1841.)