Forming, with the bases of the neurapophyses, the cross-shaped arrangement which has been described in the Pike as well as in Amia.
Cf. Raffaele, Mitth. Zool. Stat. Neap. ix. 1889, p. 179; Lütken, "Spolia Atlantica," ii. 1892; Goode and Bean, "Ocean. Ichthyol." p. 70 (1895).
K. spekii has been described as from Central Africa, but the only known specimens were obtained by Speke in Uzaramo, a district on the coast of German East Africa, just south of Zanzibar.
The most recent account of the Cyprinodonts, with much information on the habits, development, and anatomy, is by S. Garman, Mem. Mus. Comp. Zool. xix. No. 1, 1895.
On the history and habits of the Blind Fishes of the Mammoth Cave, cf. Putnam, Amer. Nat. 1872, p. 6, and Proc. Boston Soc. xvii. 1875, p. 222. For a recent account of the eyes of the Amblyopsidae, cf. C. H. Eigenmann's paper in Arch. f. Entwickelungsmech. viii. 1899, p. 545, to which is appended a complete bibliographical index to the subject.