^{page 205 note 1} Huxley, T. H., “On Ceratodus Forsteri, with Observations on the Classification of Fishes,” Proc. Zool. Soc. 1876, pp. 40–45.Google Scholar

^{page 205 note 2} See excellent figures by Gegenbaur, C., “Das Kopfskelet der Selachier” (1872), plate x.Google Scholar

^{page 205 note 3} Huxley, T. H., loc. cit. p. 42, fig. 8.Google Scholar

^{page 206 note 1} In Jordan and Gilbert's “Synopsis of the Fishes of Korth America,” Bull. U. S. National Museum, No. 16 (1883), p. 967.Google Scholar

^{page 206 note 2} See detailed descriptions of C. Hasse, “Das Natürliche System der Elasmobranchier— Besonderer Theil” (1882), pp. 39–52, pls. vi. vii.Google Scholar

^{page 206 note 3} Loc. cit. p. 50.Google Scholar

^{page 206 note 4} St. Mivart, G., “Notes on the Fins of Elasmobranchs,” Trans. Zool. Soc. vol. x. (1879), p. 477.Google Scholar

^{page 206 note 5} Günther, A., “Catalogue of Fishes Brit. Mus,” vol. viii (1870), pp. 397–399.Google Scholar

^{page 207 note 1} Jordan and Gilbert, “Fishes of N. America,” loc. cit., p. 62: and S. Garman, Bull. Essex Institute, vol. xvi. (1884), pp. 56, 57.Google Scholar

^{page 208 note 1} Münster, , “Beiträge zur Petrefaktenkunde,” pt. vi. (1843), p. 55.Google Scholar

^{page 208 note 2} A. Oppel, “Der mittlere Lias Schwabens,” Württb, Jahresh. vol. x. (1854), p. 62, pi. i. fig. 1.Google Scholar

^{page 208 note 3} Tate, and Blake, , “The Yorkshire Lias” (1876), p. 256.Google Scholar

^{page 208 note 4} This and the other Jurassic homons have been kindly supplied by Mr. Etheridge.

^{page 209 note 1} Hasse, C., “Natürl. Syst. Elasm.—Besond. Theil,”pp. 51, 52, pl. vii. figs. 23–25.Google Scholar

^{page 212 note 1} Besides others already named, I have also to thank the following friends and correspondents who have kindly assisted me in the search for Jurassic Notidanidæ:— Mr. E. T. Newton, of Jermyn Street; Mr. T. Roberts, of the Woodwardian Museum, Cambridge; Mr. H. M. Platnauer, of the York Museum; Mr. H. J, Moale, of the Dorset County Museum; and Mr. H. E. Quilter, of Leicester.

^{page 215 note 1} The lower teeth of N. einereus also exhibit some approach to this character.

^{page 215 note 2} Garman, S., “A species of Heptranchias supposed to be new,” Bull. Essex Institute, vol. xvi. (1884), pp. 56, 57.Google Scholar

^{page 215 note 3} Newton, E. T., “On Two Chimsæroid Jaws from the Lower Greensand of New Zealand,” Q. J. Geol. Soc. vol. xxxii. (1876), pp. 329, 330, pl. xxi. figs. 6—9.Google Scholar

^{page 216 note 1} In addition to Notidanus dentatus, the National Collection also comprises three teeth of Oxyrhina and one of Odontaspis from these beds; the former bear a very close resemblance to the common O. Mantelli of the European Cretaceous, though there are not sufficient materials to establish their identity; and the Odontafpis is indistinguishable from the well-known O. subulata of the same age.

^{page 217 note 1} In his second paper (1879) Probst confirms his original determination (1858) and suggests that Lawley's fossil probably belongs to N. gigas or N. Meneghinii.