Hooker, W. J. (20) Musci Exotici. Vol. II. London, 1820.
—— (61) A second century of ferns. London, 1861.
Howse, R. (88) A catalogue of fossil plants from the Hutton Collection. Newcastle, 1888.
Hughes, T. McKenny (79) On the relation of the appearance and duration of the various forms of life upon the earth to the breaks in the continuity of the sedimentary strata. Proc. Phil. Soc. Cambridge, vol. III. pt. VI. p. 247, 1879.
—— (84) On some tracks of terrestrial and freshwater animals. Quart. Journ. Geol. Soc. vol. XL. p. 178, 1884.
Humboldt, A. von. (48) Cosmos. (Translated by E. C. Otté.) London, 1848.
Huxley, T. H. (93) Science and Hebrew tradition. Collected Essays, vol. IV. London, 1893.
Jäger, G. F. (27) Über die Pflanzenversteinerungen welche in dem Bausandstein von Stuttgart vorkommen. Stuttgart, 1827.
James, J. F. (93) Studies in the problematic organisms. No. 2. The genus Fucoides. Journ. Cincinnati Soc. Nat. Hist. 1893.
—— (932) Notes on fossil fungi. U. S. Dpt. Agriculture, vol. VII. no. 3, p. 268, 1893.