^{page 413 note 2} “Geol. Yorkshire,” pt. ii, 1836, p. 237, pl. xx, figs. 65–68.Google Scholar

^{page 413 note 3} “Prod. de Paléont.,” vol. i, 1850, p. 114.Google Scholar

^{page 413 note 4} “Animaux Fossiles,” Suppl., p. 711, pl. lx, figs. 3a–d.Google Scholar

^{page 413 note 5} “Faune Calc. Carb. de la Belgique,” pt. ii, p. 83Google Scholar, pl. xlv, figs. 5, 6: Ann. Mus. Roy. d'Hist. nat. de Belgique, sér. Paléont., vol. v.Google Scholar

^{page 414 note 1} Hyatt, A., “Carboniferous Cephalopods”, Second Paper: 4th Ann. Rep. Geol. Surv. Texas, 1892 (1893), p. 414.Google Scholar

^{page 414 note 2} Op. cit., pt. ii, 1836, p. 233, pl. xxii, figs. 33, 34; pl. xvii, fig. 24 (26? 27? in explanation of plate on p. 250).

^{page 414 note 3} “Cat. Brit. Foss.,” 2nd ed., 1854, p. 309.Google Scholar

^{page 414 note 4} M'Coy, F., “Synop. Carb. Foss. Ireland,” 1844, p. 17.Google Scholar

^{page 414 note 5} “Cat. Foss. Ceph. British Museum.” pt. ii, 1891, p. 87.Google Scholar

^{page 414 note 6} Platnauer, H. M., “List of Figured Specimens in York Museum”: Ann. Rep. Yorks. Philos. Soc. 1890, p. 79.Google Scholar The locality there given (“Flaxby”) is an error; Mr. Platnauer informs me that it should have been “Flasby.”

^{page 414 note 7} B. M. No. C. 5336.

^{page 414 note 8} A specimen in the Gilbertson collection in the British Museum (No. C. 237c) is believed to be this figured example. It is but a fragment, and greatly resembles “Nautilus subsulcatus,” Phillips (=Clonautilus subsulcatus). It certainly does not agree with the specimen figured by Phillips in pl. xvii, fig. 24. The figure differs in some respects from the specimen. The periphero-lateral angles should have been represented more obtuse, and the suture-line with a narrower and shallower sinus on the periphery.

^{page 415 note 1} Nautilus quadratus, Fleming, J., “Hist. Brit. Anim.,” 1828, p. 231.Google Scholar

^{page 415 note 2} Morris, J., “Cat. Brit. Foss.,” 2nd ed., 1854, p. 303Google Scholar; Sharman, G. and Newton, E. T., “Geol. N. Derbyshire,” 2nd ed., 1887, Appendix 1, p. 182: Mem. Geol. Surv.Google Scholar; Etheridge, R., “Brit. Foss.”, vol. i, Palæozoic, 1888, p. 311Google Scholar; Morton, G. H., Proc. Liverpool Nat. Field Club for 1894, p. 23, 1895.Google Scholar

^{page 416 note 1} Hyatt, A., “Fossil Cephalopoda in the Museum of Comparative Zoology”: Proc. Amer. Assoc. for the advancement of Science, vol. xxxii, 1883, p. 333.Google Scholar

^{page 418 note 1} From Graig fawr, Prestatyn, Flintshire, and kindly sent to me for examination by Mr. G. H. Morton, F.G.S., Liverpool.

^{page 418 note 2} i.e. converging towards the plane of symmetry external to the periphery.

^{page 418 note 3} Sharman, G. and Newton, E. T., “Geol. N. Derbyshire,” 2nd ed., 1887, Appendix 1, p. 182: Mem. Geol. Surv.Google Scholar

^{page 418 note 4} Cumming, J. H., “Isle of Man,” 1848, p. 357.Google Scholar

^{page 418 note 5} Proc. Liverpool Nat. Field Club for 1894 (1895), p. 23.