313. Hatch and Corstorphine. 1905. The geology of South Africa. The Karoo System, 194.
314. Hatcher, J. B. 1905. The vertebrate fauna of the Judith River Beds. Bull. U. S. Geol.. Surv., No. 257, 67-103. (Scapherpeton and Hemitrypus.)
315. Hay, O. P. 1890. The skeletal anatomy of Amphiuma during its early stages. Jour. Morphol., IV, 11-34, with pls.
316. ——. 1900. Description of some vertebrates of Carboniferous Age. Proc. Amer. Phil. Soc., XXXIX, No. 161, 96-123. (Amphibamus grandiceps.)
317. ——. 1902. Catalogue and bibliography of fossil Vertebrata of North America. Bull. U. S. Geol. Surv., No. 179, Batrachia, 409-425.
318. Hickling, G. 1909. British Permian footprints. Mem. and Proc. Manchester Lit. and Phil. Soc., 53, 30, pl. 3.
319. Hilton, Wm. A. 1902. A structural feature connected with the mating of Diemyctylus viridescens. Amer. Nat., XXXVI, 643.
320. Hoepen, E. C. N. van. 1915. Stegocephalia of Senekal. Ann. of the Transvaal Mus., V, No. 2, 125-149, pls. xvi-xxiv.
321. Hoernes, Rud. 1884. Elemente der Paleontologie, 445-453. Leipzig.
322. Hoffman, A. H. 1873-78. Amphibien. Bd. VI, 2d Abth., Bronn's Classen und Ordnungen des Thierreiches.