[28] See for a summary, Osborn, American Nat. Dec. 1897, p. 993.
[29] e.g. the "protoloph," "metaloph," etc. (see Fig. 36, p. [51]), of the modern Ungulate form of tooth.
[30] "On the Primitive Type of the Plexodont Molars of Mammals," Proc. Zool. Soc. 1899, p. 555.
[31] Jen. Zeitschr. ii. 1866, p. 365.
[32] Proc. Zool. Soc. 1883, p. 8.
[33] Proc. Zool. Soc. 1894, p. 715.
[34] Beddard, Proc. Zool. Soc. 1895, p. 136.
[35] Quart. Journ. Micr. Sci. xxiv. 1884, p. 9.
[36] S.B. Jen. Gesells. 1885, p. 1.
[37] Proc. Roy. Phys. Soc. Edin. viii. 1885, p. 354.