For an illustrated account of the principal types of pharyngeal teeth, cf. Heckel, Russegger's Reisen, i. p. 1001, pl. i. (1843). On their variations in certain European species, cf. Heincke, Leuckart Festschrift, p. 85 (1892).

[662]

Cf. Baudelot, Ann. Sci. Nat. (5), vii. 1867, p. 339, and Leydig, "Unters. Anat. u. Histol. d. Thiere" (1885).

[663]

Cf. Noll, Zool. Gart. 1869, p. 257, and 1877, p. 351; Olt, Zeitschr. wiss. Zool. lv. 1893, p. 543; Cuénot, Bull. Soc. Zool. France, 1898, p. 53.

[664]

Boulenger, Ann. and Mag. Nat. Hist. (7), viii. 1901, p. 186.

[665]

Watase, Journ. Coll. Sci. Japan, i. 1887, p. 247.

[666]